Roborock’s Saros 20, the flagship it unveiled at CES in January, is rated at 35,000 Pa of suction, and Dreame’s newest flagship claims the same figure. iRobot went another way when it launched the Roomba Max 705 Vac and promised “180x more power-lifting suction,” with a footnote explaining that the comparison was made in spot-clean mode, on a full battery, against a Roomba 600 series robot. Neither claim tells you how much grit comes out of your hallway rug.
TechRadar’s robot vacuum reviewer, Ruth Hamilton, wrote in January that the priciest robots sat around 10,000 Pa when she started testing them, and that the figures roughly doubled around the start of 2025. Cleaning didn’t improve at anything like that pace, she wrote. Robots with far lower ratings did just as well on everyday dust and hair in her testing.
Black Friday is November 27, and robot vacuums will fill a lot of ad space between now and then, usually with the suction number in the biggest type. What follows covers the specs that predict whether you’ll like living with one, plus the running costs the sticker leaves out. There are no robot prices here on purpose, since deal prices move daily.
Read the suction figure as a ceiling
No rule tells robot vacuum makers how to measure pascals, so one brand’s 10,000 Pa and another’s may come from different test setups. Air watts, the unit a few brands prefer, aren’t standardized for robots either. And the number on the box is for the strongest setting, which probably isn’t the one the robot will run most days.
There is an international test method for cleaning robots, IEC/ASTM 62885-7. It measures the things you care about: dust removed from hard floors and carpet, larger debris and fibers. The Pa figure in an ad isn’t a result from that test. So I lean on reviews that weigh how much test debris comes off a carpet, and use Pa only to compare models inside one brand’s lineup.
Navigation decides more than suction
How a robot finds its way decides whether it cleans in tidy rows or wanders, and whether you can send it to the kitchen alone. There are three main approaches, and many mid-range and premium robots pair a laser with a front camera that handles obstacle avoidance.
| Navigation | How it works | Strong points | Weak points |
|---|---|---|---|
| Lidar (some brands call it LDS) | A spinning laser in a raised turret measures distances and builds a map | Fast, methodical rows; works in the dark; dependable room maps | The turret adds height; fabric skirts on beds and sofas read as walls; floor mirrors can throw it off |
| Camera (vSLAM) | A camera picks out landmarks such as corners and furniture edges | No turret, so a lower profile | Needs light; slower and less orderly; struggles in plain rooms with few features |
| Gyroscope or bump-based | Wheel sensors and bumpers, with little or no saved map | Cheapest | Misses spots in bigger homes; usually no room-by-room control |
Lidar is the safer default for most homes. Even iRobot, whose higher-end Roombas used camera navigation for years, gave every model in its new 2025 lineup lidar. A camera-only robot makes sense mainly when a low profile matters more than speed, and a random-pattern robot fits a small apartment with one or two rooms.
Measure three things at home before you compare
A spec sheet can’t see your furniture, so spend five minutes with a ruler first:
- Clearance under the lowest sofa or bed. Compare it with the robot’s listed height, turret included. Roborock’s Saros 10 retracts its turret to get down to 7.98 cm (about 3.1 inches), and the Saros 10R skips the turret entirely.
- The tallest threshold and the thickest rug. Listings give a maximum climbing height. If a doorway threshold is taller than that number, the robot may never make it into the next room. Rug tassels are a common place for brushes to snag, too.
- What lives on your floor. Hamilton found that robots generally don’t spot objects shorter than about an inch, which covers most cables, and no model had earned a perfect score in TechRadar’s obstacle tests. She wouldn’t trust any robot to avoid dog poop. Budget a quick pickup before each run, whatever the box says about AI.
Pet hair is a brush question
With long hair or a shedding dog in the house, the roller design matters more than the suction figure, and some brands now build features aimed squarely at tangles. Roborock’s Saros 10 and 10R, for example, use a rubber roller split down the middle so hair can work its way out through the gap and into the bin.
Side brushes are the other hair trap. Even robots with elaborate docks need their side brushes pulled off, de-haired and rinsed by hand from time to time. When I read buyer reviews for a pet household, I skip the star rating and look for one detail: how often owners say they cut hair off the roller and the side brush.
A self-empty dock comes with a running bill
Self-emptying comes in three designs. Bagged docks seal debris in a disposable bag, and iRobot says the AutoEmpty dock for the Roomba Max 705 Vac holds up to 75 days of it. Bagless docks, like the ones Shark pairs with several models, skip the bags (Shark rates them at up to 60 days), but you empty a bin into the trash yourself. The Roomba 205 DustCompactor drops the disposal dock entirely and packs debris inside the robot for up to 60 days.
Bags and wear parts are where the cost hides. Here’s the math for one model, using the maker’s own numbers. iRobot’s replacement chart for the Roomba Plus 400 series says to replace the filter and edge brush every 3 to 6 months and the main brush every 6 to 12 months. On iRobot’s US site, a replenishment kit with three filters, three edge brushes and one rubber main brush is $39.99, and a three-pack of dock bags is $19.99.
- Light use (longest intervals, assuming a bag lasts two months): one kit and two packs of bags, about $80 a year.
- Heavy use (shortest intervals, a bag a month in a house with pets): two kits and four packs of bags, about $160 a year.
That works out to roughly $240 to $480 over three years on top of the sale price, and mop pads are extra on a combo model. Third-party filters and bags cost less for popular robots, though fit and filtration vary. I’d also confirm that the brand sells genuine parts for that exact model in the US.
Mopping add-ons, and the chores they leave
Robot mops come as flat drag pads, a pair of spinning pads or a roller. On premium models the dock washes the pads, often with hot water, dries them and refills the robot’s tank. That cuts the work without ending it. Grime still builds up in the base where the robot parks, and the pads need a proper wash by hand or in the machine now and then.
For carpet, check how high the mop lifts, listed in millimeters. Roborock, for instance, lists 10 mm for its Qrevo Pro, and some flagships leave their pads at the dock before vacuuming carpeted rooms. If your rugs are thicker than the lift height, plan on no-mop zones in the app, or skip the mopping bundle and keep the difference.
The app, the account and the company behind it
Room-by-room cleaning, no-go zones and schedules mostly run through the maker’s app, usually with an account in that company’s cloud. That’s where the privacy risk lives. In 2024, owners of Ecovacs Deebot X2 robots in the US reported strangers watching through the camera and yelling slurs through the speaker. Ecovacs suggested stolen passwords were to blame and promised a security update. This February, an engineer building a game-controller app for his own DJI Romo found that DJI’s cloud answered him from about 7,000 Romo units in at least 24 countries, live camera feeds and floor maps included, until DJI patched it.
Washington has stepped in. On July 28, the FCC added foreign-produced “advanced robotic devices” to its Covered List, and its FAQ confirms that robot vacuums count when they meet the definition. New foreign-made models are generally barred from the FCC authorization they need to be sold here unless they receive a Conditional Approval. According to the FCC’s fact sheet, models authorized before the change can still be sold and robots people already own aren’t affected. A separate FCC waiver lets authorized devices keep getting software and firmware updates, security patches included, until at least January 1, 2029.
In practice, a model announced overseas this fall may not reach US stores soon, so shop from what’s listed here. Ownership is worth a look too: iRobot has been a wholly owned subsidiary of its Chinese contract manufacturer, Shenzhen Picea Robotics, since January. Before buying any connected robot, a few minutes of homework helps:
- Read the app’s privacy label in Apple’s App Store or the Data safety section on Google Play.
- Use a password you don’t use anywhere else, and turn on two-factor login if the app offers it.
- Switch off remote camera viewing and obstacle photo uploads if you won’t use them and the app allows it.
Reading a robot vacuum deal this month
The same robot is often sold in several bundles: the robot alone, with a self-empty dock, or with a full dock that also washes mops. The names can differ by one word or a plus sign, and the eye-catching deal may be for the plainest bundle. Match full model numbers and box contents before you match prices, then check the price history on that exact model number. Last year’s flagship at a deep discount is often a better buy than this year’s mid-range model at full price, and since the FCC change will likely slow new launches, it may still be the newest model sold here.
Then treat the return window as a trial period. Amazon says purchases made in November and December can go back until January 31, 2027, and Walmart has extended most returns from purchases made since October 1 to the same date. Let the robot map the house, send it under the sofa, onto the thickest rug and through the room with the most cords. If it stalls in the same spot three runs in a row, that’s what living with it looks like, and the window is still open to return it.
