There are still common nuances, I think that all models. 1. Due to the round shape of the wheels, a small piece of the corner remains intact. Although I think this is a common problem. 2. Cloths should be washed frequently. Cleans clean, they get dirty quickly. Pros below: The windshield wiper robot is an insanely useful invention in itself: washing a window takes 30 minutes instead of one day (this includes preparation for washing and cleaning after it). And the presented model does it well and simply. The instructions describe a three-stage window washing scheme: first a dry pass, then with a cleaner, then a final pass to eliminate streaks when the liquid is applied in a certain way. Nimble, not too loud. Washes really on 5. Cons: Even rather washes at 5 minus: 1. Sometimes it cannot immediately climb onto the window if it is already very dirty (if the window has not been washed for a long time, then a powerful layer of soot remains on the window from the street side). 2. Sometimes dulls: for example, it can stop washing in the middle of the window. But not critical - to continue on the remote, just press the "next" button