Saros 20 Sonic
A very low robot vacuum that cleans carpet superbly and climbs door bars better than almost anything. The catch is its vibrating mop pad, which two of three testers found weak on dried-on stains.
See the alternatives below, or switch market.
The short version
The Saros 20 Sonic is the Saros 20 with a different mop. Where the standard model spins two round pads, this one has a single flat pad that vibrates and slides out to reach skirting boards. It also swaps the Saros 20's camera-only navigation for a laser that pops up when it needs to look around and sinks down to fit under furniture. The Saros 10 used the same pop-down laser and vibrating-pad idea a year earlier.
The trade-off is simple. Vacuuming is excellent, and it gets over thresholds that stop most robots. Mopping is the weak spot: the pad copes with light everyday grime but struggles with anything dried on.
It isn't on Roborock's UK or Australian stores at the moment.
Our take: Buy it if your home is mostly carpet and rugs with awkward door bars, and mopping is an occasional wipe rather than a daily job. If you want a robot that really scrubs a kitchen floor, the rotating-mop Saros 20 did much better on dried stains in the same studio test. If you want the pop-down laser without paying flagship money, look at the Saros 10.
What reviewers found
Three tests so far: Vacuum Wars in its studio, Senses.se at home with the Complete bundle, and SmartHomeAssistent on a scored test course. All three rate the vacuuming and threshold climbing highly. They split on the mop: Senses was impressed, while the other two found it weak on stubborn stains. Senses also hit a self-emptying fault that nobody else reported.
Vacuum Wars, hands-on · Senses.se, hands-on, Jun 2026 · SmartHomeAssistent, hands-on, Jul 2026
The mop is the compromise
Vacuum Wars called mopping the major trade-off. Its combined mopping score was 15.8 against a category average of 20.3, and the standard Saros 20 scored 25.2. SmartHomeAssistent rated the mop unsatisfactory, with stubborn stains mostly left behind, and the robot didn't stop when it met spilled liquid. Senses.se was much happier, saying the pad removed basically everything on its first run. Senses was mopping everyday dirt; the other two used set-in test stains. So it copes with light grime, and dried-on spills need a different robot.
Excellent vacuuming, especially carpet
SmartHomeAssistent gave vacuuming its top grade, with near-perfect pickup on laminate and strong results on ordinary and deep-pile carpet. Vacuum Wars measured 92% on its carpet deep-clean test, well above the 78% average, and found no hair wrapped round the brush. The soft spot was embedded pet hair in carpet: Vacuum Wars measured 78%, a little below average, while SmartHomeAssistent saw hair fully removed from hard floors and ordinary carpet. If you have a moulting dog, treat it as good rather than best-in-class.
Gets over door bars others can't
Vacuum Wars measured a 57mm climb and SmartHomeAssistent logged 5cm. Neither got near the advertised 8.8cm, which applies to a two-step threshold. Senses.se found it gets over the tricky ones but sometimes spends two or three minutes backing up and retrying. If you have raised thresholds between rooms, few robots will cope better. Just expect some shuffling on the worst of them.
Good at dodging clutter
SmartHomeAssistent spotted 15 of its 16 test objects, and Vacuum Wars recorded 19 of 24 obstacles avoided. Senses.se never had it tangle in a cable during testing, though it did mistake rug fringes for extra dirt and made pointless extra passes. That's a better showing than most robots manage, but it isn't perfect, so a quick tidy of socks and charger leads is still worth doing.
Small bin, and one emptying fault
Vacuum Wars measured the bin at 228mL against a 377mL average, so the robot depends on the dock to empty it. Senses.se found that it sometimes failed to empty but kept cleaning anyway, spreading dirt, and the app gave no warning. No other tester reported this, so it may have been one unit or early software. Watch the first few runs, and contact support if you see it.
This covers the vibrating-pad Saros 20 Sonic only. Senses tested the Complete bundle, which adds spare consumables. The rotating-mop Saros 20 and the roller-mop Saros 20 Flow are different models.
Before you buy
The questions people ask about this one
Is the vibrating mop as good as spinning mops?
Not on tough stains. Vacuum Wars gave it a clearly lower mopping score than the standard Saros 20 with its spinning pads, and SmartHomeAssistent rated it unsatisfactory on stubborn marks. Senses.se found it fine for everyday dirt. If mopping matters most, the Saros 20 is the safer choice.
Does it fit under low furniture?
Very likely. It's 7.98cm tall and can squeeze down to 7.95cm with the laser lowered, per the specifications, and Vacuum Wars measured about the same. Measure the gap under your sofa first; plenty of rivals need 10cm or more.
How does it handle rugs and door bars?
Very well. Vacuum Wars measured a 57mm climb and SmartHomeAssistent recorded 5cm, both top results. Senses.se noted it can take a few minutes to work its way over awkward thresholds, pushes thin rugs about, and treats rug fringes as extra dirt.
Will it avoid cables and pet mess?
Better than most. SmartHomeAssistent found 15 of 16 test objects, Vacuum Wars avoided 19 of 24, and Senses.se had no cable tangles. It still missed some things, so tidy loose leads and don't leave it alone with a pet accident.
How often do I have to empty or refill anything?
The dock empties the robot for up to 65 days between bag changes and washes the mop in hot water, per the specifications. The robot's own bin is only 228mL, according to Vacuum Wars, so check early runs: Senses.se saw it skip emptying and carry on cleaning.
Compare with
Saros 20
Same low body and climbing claims, with spinning mops that scored far better on stains in Vacuum Wars' tests.
It has no laser turret, and RTINGS found its obstacle avoidance inconsistent, especially on carpet.
Saros 10
The same pop-down laser idea a generation earlier, and testers found it great with pet hair and dependable over months.
It also uses a vibrating mop that needs higher settings for dried stains, and it climbs lower steps.
X60 Pro Ultra Complete
Cleaning power, obstacle-crossing hardware and the dock are consistently praised.
Reports of getting stuck, long cleaning times and high water use make it less effortless than the spec sheet suggests.
Full specifications
Figures come from the manufacturer’s product page unless a source is named. A blank means nobody we trust has confirmed it.
Owner reviews
Own a Saros 20 Sonic?
Tell people how it’s held up: cleaning, maintenance, faults and support. Owner reviews are shown separately from expert tests and never mixed into the score.
Sources
Everything cited on this page. Expert scores are shown as the reviewer gave them.
- Vacuum Wars: Roborock Saros 20 Sonic Robot Vacuum Review: Strong Performance with One Major TradeoffHands-on
- Senses.se: Roborock Saros 20 Sonic Review: Incredible Mopping and High-Threshold Mastery · 8.0/10Hands-on
- SmartHomeAssistent: Roborock Saros 20 Sonic test · 2.3 (Gut)Hands-on
- Roborock: Saros 20 Sonic product page and specificationsManufacturer
- Roborock US: Saros 20 Sonic US store pageManufacturer