Our brand new Roborock S6 performed excellently for two months before experiencing constant "main brush might be blocked" errors. The second one had mapping problems. The third also has mapping problems, and in addition it keeps getting "main brush might be blocked" errors.
One mapping problem is that it creates pieces of rooms behind walls or in other rooms. Here's an extreme closeup showing a blue room with tiny pieces of it in the next room:
Another mapping problem is that the "Divide" function sometimes only work when you're connected by cellular rather than WiFi. If you try to do it through WiFi then you might get "WiFi connect error" messages, even when right next to the WiFi.
The map of the house is tilted, but the Roborock S6 still makes perfectly horizontal and vertical paths. Here's an image of the tilted map with horizontal and vertical path lines:
We'd just like a Roborock S6 that works or our money back.