Having previously tried one of the cheaper window cleaning robots on the market I wasn't very impressed. But it seemed to me that this one turned out to be more powerful and intelligent. I have to say I'm absolutely delighted, it covers every window area twice linearly and faster and more thoroughly than a paper towel. I made a video as I couldn't find much about this device and hope it can help someone else. I have found it difficult to move the mopping pad when it gets too wet. So it's a good idea to have dry windows to start with, but you can still spray window cleaner on the windows and it works great. The cleaning solution is of great importance. It pretty much just clears the fog, which is pretty cool. I cleaned 8 dirty selfie sliding windows with a mop so it took longer than I expected. I'll update my review if needed, but so far this is great.