Roomba S9+ Robot Vacuum Review 2023
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In 2002, iRobot introduced the first Roomba. Since then, the brand name Roomba has become synonymous with “robot vacuum.” Though dozens of other brands have entered the space, iRobot continues to stay ahead of the innovation curve and regular earns spots in our guide to the best robot vacuums.
In September 2018, iRobot introduced the Roomba i7+, which was the first robot vac that featured a charging dock that emptied the dustbin. Based on feedback, iRobot made tweaks to the design and features of the i7+ and launched a new top-of-the-line model, the s9+, in October 2019.
The Roomba s9+ is innovative because it has increased suction power, a D-shaped design, two long main brushes with unique positioning, and a longer-lasting battery. I’ve tested the s9+ for several months now — it’s the main vacuum I use when not testing other models — and here’s what I like about it.
Design and specs
There are a few design choices that make the s9+ different from other Roombas. The most obvious one is the D shape, which is supposed to help it get deeper into corners. The unit is remarkably small at 12.5 inches in diameter, but the height is comparable to other units at 3.5 inches.
The small body size is impressive considering that it has two of the longest main brushes I’ve seen at 9.5 inches each. The brushes are located closer to the front of the unit than most other robot vacuum models. The forward design and length of the brushes are supposed to facilitate better corner cleaning and make it easier for the robot to pick up debris on a single pass.
Though iRobot doesn’t give precise suction power measurements for its robots, it claims that the s9+ has suction 40 times more powerful than the Roomba 600 Series and four times more powerful than the next strongest Roomba and s9+ predecessor, the i7+.
The Roomba s9+ comes with a Clean Base that charges the robot and empties its dustbin. The box also contains an extra high-efficiency filter, an extra side brush, and an extra dirt disposal bag.
When the s9+ is done cleaning, it goes back to its base and empties the dirt it collected into a standing bin.
Setting up the Roomba s9+ took longer than most robot vacuums I’ve tested, but I still had it up and going in under half an hour. After unboxing the elements and finding a spot for the Clean Base, I plugged it in and set the vac on the charging dock.
Next, I downloaded the iRobot app and installed firmware updates. The updates took the bulk of the setup time. Once they were installed, I scheduled the s9+ to clean daily, which was an effortless task taking only a few seconds.
I liked that when I scheduled the vac, it let me choose how powerful the suction is. On its lowest setting, the battery lasts for two hours. On the highest setting, it only runs for about 45 minutes. I chose the highest setting, and since I have more space than the Roomba can clean in 45 minutes, it just returns to the dock to charge and automatically finishes the cleaning cycle once it has enough juice.
Connecting to Amazon Alexa was a seamless process. I just added the iRobot skill in the Alexa app, and it was ready to go.
Cleaning with the iRobot Roomba s9+
The most important feature of any robotic vacuum is its performance. How well can it pick up debris on a variety of surfaces? To test this, I pour a tablespoon each of flour, kitty litter, and coffee grounds along with pet hair on low-pile carpeting and hardwood flooring. Then, I run the vacuum on high for two cleaning cycles, measure the contents accumulated in the robot’s dustbin, and compare before and after photos to estimate how much of the debris the vacuum picked up.
On hardwood, the Roomba s9+ did better than any vacuum I’ve ever tested. All of the kitty litter, pet hair, and coffee grounds were gone, and I only found a trace of flour left over. The performance on carpeting was only slightly less impressive. Gone were the coffee grounds and pet hair. Only around 5% of the kitty litter and 10% of the flour were left behind.
I also tested how well the s9+ does at cleaning corners by sprinkling a teaspoon of flour into hardwood and carpeted corners. Though the D-shaped vac came within an inch of the carpeted corner, it only picked up about 30% of the flour. This is likely due to the powerful main brush not coming into direct contact with debris. On the other hand, on hardwood, the unit did much better, picking up around 85% of the flour and coming within 1. 5 inches of the corner.
Roomba s9+ cleaning flour in the corner before (left) and after (right) on hardwood (top) and carpet (bottom).
The s9+ rarely gets stuck. On our testing course, which contains cords and other obstacles, it did not get stuck at all. And, in my daily use, it tends to only run into issues when one of my messy family members leaves clothes on the floor. The s9+ will try to suck them up, and I’ll get a notification that the main brushes need to be untangled. This is easy enough to fix.
In addition to performing well, the Roomba s9+ is packed full of features that work as advertised. My favorite feature is the Clean Base, which serves as the charging dock and empties the vac’s dustbin. The dust is collected in a disposable dirt bag, which you only need to replace every month or two when the app notifies you.
The iRobot app is among the best robot vacuum apps I’ve used. You can use it to do basic tasks, like schedule cleanings, as well as more complex functions. For instance, once the s9+ maps your home, which can take several cleaning cycles, you can schedule it to clean specific rooms at certain times. I also liked that I could set no-go zones that the unit would automatically avoid.
Cons to consider
The biggest negative with the Roomba s9+ is how loud it gets. On its highest suction setting, my sound meter measured 77 decibels, which is comparable to heavy city traffic. The vac was better on its lowest setting at 64 decibels — about the same as a normal conversation. In my testing, I’ve found stronger suction is usually correlated with louder operation, and that appears to hold true with the s9+.
It took at least four cleaning cycles for the s9+ to be able to map the layout of my home. This was annoying because, in the meantime, I couldn’t set no-go zones, and I had some areas with several wires that the vac would get caught up on. Fortunately, I was able to set no-go zones eventually, and the robot did a good job of obeying them.
What are your alternatives?
Robot vac technology is changing all the time, so check out our guide to the best robot vacuums for our most up-to-date recommendations. I’d like to add that Roomba also has a more affordable self-emptying Roomba, the i3+ (currently $499.99 on Amazon). At nearly half the price of the s9+, you sacrifice some mapping capabilities and suction power, but it’s still an impressive device that performs better on carpeting than any of the other vacs I’ve tested.
The bottom line
This graphic from iRobot shows the details of the brushes and wheels on the s9+.
Despite these minor negatives, I think the Roomba s9+ is one of the best robot vacuums available. I especially like that it empties the dustbin itself so I don’t have to remember to stay on top of that between cleanings.
The s9+ is one of the most expensive robot vacuums on the market. Even the most affordable robovacs are luxury items and do not replace traditional upright models. So, we mostly just recommend the s9+ to consumers who have significant expendable income and want a low-fuss device that automates the chore of vacuuming. The s9+ is also a great option if you simply must have the most innovative gadgets. It’s the top-of-the-line model from the top name in robot vacuums.
Robot vacuums are usually deeply discounted during the major sale days, such as Black Friday, Cyber Monday, and Amazon Prime Day. So, if the s9+ is just outside of your price range and you don’t mind waiting, keep your eyes peeled for deals.
Pros: Features a useful app with virtual no-go zones, large main brushes, charging dock that empties the unit’s dustbin, does better on hardwood floors than any other vac we’ve tested, good performance on carpeting
Cons: Didn’t clean carpeted corners well in our tests, loud, takes several cleaning cycles to create a floor map
Senior Reporter, Insider Reviews
James is a Senior Reporter for Insider Reviews, specializing in sleep, HVAC, vacuums, and kitchen appliances.
He has tested more than 70 mattresses from startups like Casper and legacy brands like Tempur-Pedic, using his background in experimental psychology to develop objective tests and evaluate comfort, support, motion transfer, and more. He authors our guide to the best mattresses.
In addition to being Insider Reviews’ mattress expert, James has extensively covered vacuums, air conditioners, air purifiers, and more within the HVAC space. He’s tested more than 40 vacuums from brands like iRobot and Dyson and is no stranger to keeping his house at a chilly 60 degrees Fahrenheit for weeks on end, all in the name of testing air conditioners.
He’s a multifaceted writer who has covered everything from health and fitness to consumer technology. His mission is to help people get the most value for their money by guiding them in making informed buying decisions.
James lives in Lansing, Michigan with his wife, two kids, a tabby cat, and a rambunctious rat terrier. When James isn’t testing products and writing for Insider, he helps run a popular local Facebook group, Lansing Foodies, and plans the Olive Burger Festival.
See below for some of his work:
- The 16 best mattresses for a good night’s sleep, tested and reviewed by sleep experts
- The 7 best vacuum cleaners for every type of mess, budget, and floor type
- Travel guru Rick Steves never checks a bag. Here are the 25 things he always packs in his carry-on.
- I toured 8 distilleries on the Kentucky Bourbon Trail – here are the 16 best whiskeys I tried and where to buy them
- The 10 best bourbons we recommend after tasting over 100 bourbon whiskeys and talking with experts
- The 6 best air fryers that are actually worth the counter space
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iRobot Roomba S9 Plus review
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Could the iRobot Roomba S9 Plus be the future of robot vacuums?
(Image: © TechRadar)
The Roomba S9+ sweeps away a host of bugbears that have plagued robot vacuums: emptying itself, capturing allergens, conquering corners and providing truly customisable vacuuming from an app on your phone. Its price tag might be steep but if you value spotlessly clean floors with minimal mess and effort on your part, the cost could be worth it.
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It’s been almost 20 years since the original Roomba robot vacuum launched and now robot vacuums are ten-a-penny, and a staple in many households.
iRobot’s latest incarnation, the Roomba S9 Plus, might operate on similar principles, but thanks to a host of high-tech features, it’s a very different beast from the first iteration, and one of the best robot vacuums we’ve tested to date.
Most noticeably, it’ll empty itself, meaning that rather than shaking out a dust box every few days, it’ll whisk out the contents from the vacuum into a bag in the charging station. As the capacity of the bag is 14.9oz / 440ml, which equates to around 30 cleans, this turns a daily job into a monthly one – great for those who are time-poor or dislike emptying the dust box. There’s also a filter for allergy sufferers that captures 99 percent of mould, pollen, and dust mite allergens.
- iRobot Roomba S9 at iRobot for $1,099.99
iRobot Roomba S9 Plus price and availability
Should I buy?
Another feature that sets the Roomba S9 Plus apart is an advanced mapping system. Rather than being gimmicky, this has a practical purpose, meaning that the vacuum knows where it’s been, and where it still needs to clean, eliminating long running times that still end up with missed patches. It’s known as vSLAM navigation technology, where the robot gathers over 230,400 data points each second – resulting in a better clean and more control over which areas are vacuumed and when. While the mapping can initially seem like a chore, once it’s up and running, this provides cleaning flexibility and efficiency that budget models can’t replicate.
A final advantage is that the Roomba S9 Plus is compatible with the iRobot’s Braava jet m6 robot mop. The two robots can ‘talk’ to each other, automatically vacuuming and then mopping without any additional commands, leaving hygienic floors behind – great for busy households, families, and properties with large areas to clean.
In addition, the Roomba S9 Plus promises a powerful cleaning system alongside its advanced features, which include a 3D sensor, wider brushes, and a corner brush.
There’s no denying this is an expensive appliance but its cleaning ability, certainly on hard floors, means we think it really is worth it – making it ideal for those that want to outsource the vacuuming completely. With Roomba Black Friday deals abound, you might even find this at its lowest price yet.
iRobot Roomba S9 Plus price and availability
- List price: $1,099. 99 / £1,499.99 / AU$2,899
The iRobot Roomba S9 Plus, which is called the Roomba S9 Plus Robot Vacuum in Australia, is priced at $1,099.99 / £1,499.99 / AU$2,899. It’s available to buy now worldwide from the iRobot’s website as well as Amazon.
It can be bundled with the Braava jet m6 Robot Mop for $1,349.99/ £1,999.99/ U$3,698. In the US, it also comes in a bundle with the Braava jet m6 Robot Mop and iRobot h2 Handheld Vacuum for $1,474.98.
Compared to similar models, the iRobot Roomba S9 Plus is pricey but in return, it promises the brand’s deepest cleaning yet (up to 40 times the suction of previous generation Roomba vacuums), and a more accurate room mapping system so it won’t waste time going over the same areas.
Replacement dirt disposal bags cost $19.99 / £21.95 / AU$59 for three.
(Image credit: TechRadar)
- Self-emptying bin
- 30% wider rubber brushes
- Convenient control buttons on top
While the iRobot Roomba S9 Plus doesn’t look dissimilar to previous Roomba models – its rose-gold lid hiding the bin being one of the more noticeable differences – it’s host to many improvements. These include wider Dual Rubber Brushes (compared to the Roomba 600 series) and a brush with five angled arms to really get into corners and along walls. On top there are just three buttons – one to start and stop it cleaning, one for spot cleaning and one to send it home – all of which are useful if you don’t have your device to hand.
Compared to some, it’s a fairly weighty machine to carry from room to room at 8.15lb / 3.7kg, but not too large. Its height of 3.5 inches / 9cm isn’t too tall to tuck under most beds although it may be too tall to fit underneath some sofas. The Roomba S9+ is an average 12.25 inches / 31cm wide but it’s the charging station you may struggle to find room for. At 19 inches / 48cm tall and 12.2 inches / 31cm wide it takes up a decent amount of space against a wall, especially when allowing for the suggested clearance of 1.5ft / 50cm either side on top.
Set-up was fairly simple as it’s all done via the app (see below) but it can be frustrating waiting for it to map your home as a non-negotiable first task. There’s an extra filter and corner brush included in the box, plus a couple of dirt disposal bags. It might be a small thing but even the bags make sure you won’t ever have to come into contact with the dust from your floors – each one seals up as it’s removed from the charging station.
(Image credit: TechRadar)
- Good dust pick-up on carpets and hard floors
- Power Boost increases suction for carpets
- Noisy when emptying
The iRobot Roomba S9 Plus sucked up all the fine dust, biscuit crumbs, and oats we sprinkled on hard floors but it did leave some fine dust behind on our medium-pile carpet, both on the Quiet clean setting and the more powerful Detailed clean. That said, even our usual vacuum cleaner struggled to pick up the fine flour afterwards, suggesting that it was fairly embedded in the pile after being rolled over a few times.
Overall, we were impressed by the cleaning efficiency of the iRobot Roomba S9 Plus – while it can still get caught on rugs, it reached the edges of rooms to whisk away dust and navigated furniture well. The Power Boost feature automatically increased the suction when it detected carpets, too.
It is fairly noisy compared to other robot vacuums registering 61db on carpet and 64db on a hard floor on our decibel meter when using the Detailed Clean mode, which is equivalent to the sound of conversation in an office. While this level is acceptable, the automatic emptying averaged 77.5db – the same level of noise experienced when 25 ft away from a vehicle traveling at 65mph, so it might be best to keep the charging station out of a social area.
Clean-up after vacuuming was effortless as the iRobot Roomba S9 Plus empties into the charging station, although the dust bag needs replacing after it’s been emptied into around 30 times (making for a monthly or bi-monthly empty). It’s actually the filter that needs more maintenance with a suggested weekly shake to clean (or twice a week if you have pets). It’s located within the robot’s dust box, so you will have to get a little messy to remove it, but it’s worth doing to maintain the filter’s anti-allergen properties.
(Image credit: TechRadar)
- Connects via WiFi
- Alexa and Google Assistant compatible
- Find your Roomba feature
Connecting the iRobot Roomba S9 Plus to WiFi using the app was relatively straightforward although we had to move location a couple of times before it worked. The app itself isn’t complicated – there’s a history of previous cleans, the ability to save one as your favorite, details of the room map (with the ability to name each space and divide it as you see fit) plus a section for schedules. One thoughtful touch is that you can name your vacuum cleaner – handy if you have two on different floors.
It took some time for us to work out how to change the suction level – an option that is stuck in the settings rather than being on the initial launch screen. Voice integration (available for Alexa and Google Home) is also not especially obvious – it’s hidden within a section labeled Smart Home. However, once linked, you can ask for it to start vacuuming, clean a specific room, or return to its dock.
One feature we did like is the ability to find your Roomba by tapping the app so the vacuum makes a noise. This came in handy when the robot vacuum became stuck under a bed.
(Image credit: TechRadar)
- Will ‘intelligently recharge’ for the amount of time needed to continue cleaning
- Battery takes around three hours to fully recharge from flat
- Indicator level doesn’t show a percentage
iRobot doesn’t make claims about how long the Roomba S9 Plus’s battery lasts between charges – perhaps this is because it’ll happily return to its charging station if it’s running low, and recharge just enough to finish the job.
Our ground floor clean took just under an hour, and on the app, the battery level looked about half-full, although we’d have preferred if the indicator showed a percentage rather than us having to guess how much charge was left. It took three hours to fully recharge the S9+.
(Image credit: TechRadar)
Should I buy the iRobot Roomba S9 Plus?
Buy it if.
You have allergies
Thanks to the self-emptying function and a bag that only needs to be emptied occasionally, the iRobot Roomba S9 Plus is a good choice for those with pollen, dust mite, or mould spore allergies.
You want more control over your cleaning
If previous robot vacuums have missed areas or spent a long time cleaning, the iRobot Roomba S9 Plus makes an excellent upgrade. Being able to direct it to the room or area that needs attention is great for preserving battery life as well as unnecessary extra passes.
You want to ask someone else to clean up
Being able to ask the iRobot Roomba S9 Plus via voice control to clean up spills when you have your hands full is a useful function – great for busy households or if you’re just dashing out of the door.
Don’t buy it if..
You won’t use all its functionality
The iRobot Roomba S9 Plus has a lot of great features, but if you’re unlikely to use its app controls, a more simplistic model might be a better fit.
You’re on a budget
There’s no getting away from the fact that the iRobot Roomba S9 Plus is a pricey machine. If you’re on a budget it’s one to avoid.
You don’t want a noisy robot vacuum
During cleaning, we found the S9 Plus was louder than other robot vacuums we tested, and it reached peak noise level when emptying its dust box. If you’re not a fan of noisy appliances, then this isn’t the robot vacuum for you.
First reviewed: July 2021
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iRobot Roomba S9: Price Comparison
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Freelance journalist Rachel Ogden has more than 20 years’ experience but for the last 14 years, she’s worked exclusively in interiors, writing about everything from large and small kitchen appliances to the latest home tech. Partial to strong coffee, low-fat chips, and any kind of cake, there’s nothing she likes better than a time-saving gadget.
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Roller Brushes Replacement IRobot Multi Surface reviews and…
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788Z”> Published on June 29, 2022
Description Roller Brushes Replacement IRobot Multi Surface
Compatible Model: This rotating brush compatible with iRobot Roomba s9 series(9150) s9+ s9 Plus (9550). High quality rubber roller brush: environmentally friendly material, durable, delicate and soft, effectively help the robot vacuum cleaner to clean the floor. Replacement Accessory Kit includes: 1 set of Roller Brushes for Roomba. Easy to Install: Snap into place for quick and easy scheduled replacement. No tools required, easy to replace the main brush. Any questions please contact us freely. 30 days money back, 24 hours online service.
Definitely the loudest, best for vacuuming and floor maintenance
Kristen G. Green 9 0003
I thought maybe people were exaggerating in other reviews, but the Roomba is noticeably louder now, especially on carpets. Review edit: They went silent on their own after “breaking” some of them. So far they have been much more durable than the official ones I would already replace.
Compatible Model: This rotating brush is compatible with iRobot Roomba s9 (9150) s9+ s9 Plus (9550) series robot vacuum.
Wrong size – brushes
Yolanda J. Johnson
It appears to be the same model and style, but slightly wider than the original. They keep rubbing against each other and Roomba keeps saying “Remove the brushes” but nothing happens. So with them, the rumba is practically useless. You have to rotate the brushes about 10 times to clean just the living room.
High quality rubber roller brush: Eco-friendly material, durable, delicate and soft, effectively help the robot vacuum to clean the floor.
Not everyone fits in a vacuum
Andrea W. Walters
Ethiopia, Addis Ababa
One of the three kits ordered had a defective roller with a drive shaft too long to fit in a vacuum. The picture above shows the original roller and the bottom is the new one, note that the bottom one protrudes above the line. Easy enough to get back. Let’s see how well they actually work in a vacuum.
Easy to Install: Snaps on for quick and easy routine replacement. No tools required, easy to replace the main brush.
These do not fit properly.
Jill B. Bell
They don’t fit properly. None of the aftermarket rollers work in s9. I tried videos from several providers. Unfortunately, only the real official $40 Roomba videos work. These rolls seem too big. When the rumba sounds on the carpet, then it is the loudest. Looks like he damaged the car. Does the manufacturer test them? Too bad the manufacturer will never see these reviews as these used car sellers don’t or can’t communicate with…
Not as good as advertised
Robot Dust Vacuum cleaner Roborock S5 MAX Global, black