iRobot Roomba s9 Review

The S9 has a unique shape compared to other Roomba products, utilizing a square front to help get into corners better.

Navigation

The s9 had no issues at all at finding its docking station in our tests, regardless if it was in the same room or a different room as its charging base when it was sent home.

The s9's navigation sensors didn't trigger any false-positives for obstacles or drops when it transitioned from dark to light flooring or vice-versa. This robot also had no issue cleaning under low pieces of furniture and would clean wherever the robot could physically fit.

In terms of navigating around a set of furniture in a single room, the Roomba s9 did well but we weren't exactly blown away by its performance. In the first trial, the s9 seemed quite clumsy, crashing into a decent amount of our test furniture. It doesn't seem to have any physical bumpers, as it would repeatedly ram the same piece of furniture. This seemed to be a bit suspicious for a top-tier robot so we ran a training run and tried it again. It did significantly better in the second trial, making it through the tight spaces under and around a table and chairs without issues but still did have the occasional collision.

The s9's navigation is supposed to improve each time it cleans the same area but we felt that some of its predecessors handled our test room a little more delicately right from the start. However, the s9 still did far better than the lower tier of robots.

Home Coverage

The s9 has an impressive set of spot cleaning abilities, covering an area just over 12 sq. ft. The s9 follows the same cleaning pattern as the other Roomba vacuums, spiraling out and then back into the point where you it started from. Additionally, you can send the s9 to clean a specific room once it has made a map of your house.

This robot easily cleans multiple rooms and does have the capability to find its charging base and resume cleaning if the battery dies while cleaning. The s9 is compatible with iRobot's virtual barrier system but none are included with the robot and must be purchased separately. You can set the virtual barrier to project a wall that measures 10' in length or a circle that has a 4' diameter. You can also create virtual no-go zones in the companion app without using a base station.

The s9 is relatively fearless while cleaning and will enter cramped and confined areas without hesitation to clean. It usually gets the vast majority of the areas in our test room but does habitually miss areas around its charger, leaving some of the rice we scattered around it untouched even after three passes. The s9 can also get slightly off while doing rows in its lawnmower pattern and fail to overlap, leaving a small amount of mess between rows.

Carpet Cleaning

The Roomba s9 did well in our edge cleaning test, getting within a half-inch of the walls and the corners in our robot test pen. It by far delivered the best performance of all the Roomba models we have previously tested.

This robot vacuum also completely floored us in our flour test, which is one of the most difficult cleaning challenges we put these products through. There was only a tiny bit of flour left after the s9 did its cleaning passes on the top of the carpet that wasn't noticeable unless you had your face right at the carpet.

The s9 continued its cleaning dominance into our rice test on the flatter carpet, only leaving 1-2 grains behind after the test. We also noticed that it seems the s9 has some sort sensor inside that alerts it if it misses some of the mess on the carpet. It didn't collect a ton of rice on the first pass but then backed up and went over it again until it collected most of it. Performance dropped a bit with the fluffy carpet but the s9 still only left about an eighth of a teaspoon of rice behind deep in the piles of the carpet. It did about the same with the oats but the performance was flipped, with the s9 doing better with the fluffier carpet than the low-pile carpet, as it missed a decent amount of crumbs on the flat carpet.

This Roomba finished out with a strong showing with the larger Mini-Wheats, sucking up all of them from the medium-pile carpet and only leaving half of one behind on the low-pile carpet.

Hard Surface Cleaning

The s9 did even better at cleaning in close to the edges of the test pen, as its rotating side brush is significantly more effective on the hard floor than on the carpet. It still left a border of flour around the edges that measured about ½" across but it cleaned much further into the corners this time around.

The s9 very much impressed us with its performance at cleaning up flour from the laminate floor. It left almost no residue at all and didn't fling any to the side. Its wheels did pick up some flour but it didn't track it around.

Regrettably, the Roomba s9 only did a so-so job when it came to collecting rice and oatmeal. It easily picked up the bulk of the mess in both of these tests but the rollers tend to fling some of the rice and oats to the side. This usually gets thrown in the path of the robot, so it gets cleaned up eventually but it does occasionally miss some of the debris.

It finished with an alright showing with the larger pieces of cereal, sucking up four of the six Mini-Wheats in our test. It does have the clearance to roll over them but they do periodically get bound up under the robot and miss the extractor head or get pushed around instead of getting picked up.

Pet Hair

The Roomba s9 collected 53% of the hair we spread out from the fluffy carpet and 50% from the low-pile carpet. While this might not sound that impressive, the s9 collected 10-30% more pet hair than almost every other vacuum in the group.

Smart Connect

We never really had any issues with this robot staying connected to our WiFi throughout our testing and this model of robot vacuum is compatible with various smart home systems, such as Alexa, IFTTT, or the Google Home Assistant.

Through the mobile app, you can locate the robot, view a cleaning map of the house, adjust the suction power and other cleaning settings, and set maintenance reminders for things like the filters.

It is also exceptionally easy to set up a schedule with the s9's companion app, which offers you a ton of different options to customize its cleaning routine. You can even have it clean specific rooms once it has created a map of your house.

You can't adjust the schedule from the robot, you can only use the mobile app. However, you can start a spot clean, full cleaning cycle, or send the robot to its docking station using the three dedicated buttons on the robot.

Value

This is a great robot vacuum but it is far more expensive than many other good vacuums out there, making it hard to recommend as a bargain buy.

Conclusion