Roborock Saros Z70 Review: OmniGrip Doesn’t Quite Work

I spent a few weeks lying in wait around my house, stalking it. My poor OmniGrip got into trouble all the time. I spent a morning wrestling the arm out of our freestanding toilet paper holder in the bathroom. It pulled all the kitchen towels off the rack. The emergency stop button (and the child lock) work, but you still have to pry the item out of its claw.

Roborock has acknowledged in an email that there are many weird limitations to OmniGrip. For example, it does not recognize shoes that aren’t on a hard surface, so it can't pick up a flip-flop on carpet. Sometimes it picks something up and immediately puts it back down again.

If you want to pick something up remotely, you have to position the robot vacuum carefully until the desired object is within a “blue zone” in the camera view. Even without acknowledging that it's hard to navigate in the app without any dead reckoning, the vacuum failed several times to recognize a crumpled tissue in the blue zone at all. Also, for the time being, the app warns you to be physically near the vacuum. That pretty much negates the “playing with your lonely pet from the office” ideal use case.

After a month in my chaotic house, the Saros Z70's machine learning is so confused that it simply doesn’t sort anything at all. Most days, it cleans, then turns around in a circle and says, “Sorting failed” before returning home to sulk. That’s not to say that it can’t work; these problems seem like they could be fixed with a few software updates. Unfortunately, it doesn’t work well right now.

As far as the rest of the robot vacuum goes, the one major difference between the Saros Z70 and the Saros 10R is that the battery life is much shorter on the arm-wielding bot. Whereas the Saros 10R can usually clean the whole first floor of my house in one go, the Saros Z70 often returns to the dock mid-clean to recharge; my 9 am scheduled clean can last until 2 or 3 pm. This isn’t a problem for me, but it could be a factor if you start your vacuum after dinner and want it to be done before you go to bed.

Roborock has the best navigation system I’ve tested so far. The proprietary name is StarSight Autonomous 2.0, and it’s basically lidar—pulsed lasers that give the robot real-time information as it navigates around your house. It also has a camera on the mechanical arm (hence, why it got tangled up in the toilet paper holder) as well as on the front of the vacuum, but like all Roborock vacuums, it adheres to TÜV Rheinland security standards and the ETSI EN 303 645 cybersecurity standards, so I feel OK with it moving around my house.

I am perpetually impressed by how well the Roborock navigates around obstacles; with two kids and a dog, my house is unusually full of stray items. When the Saros Z70 was running, I deliberately stopped picking up as much as I normally do to see if it got tripped up. Other than a few items that no robot vacuum could have coped with, like my daughter’s doll’s hair, it coped remarkably well.