Washing windows with a robot is much more convenient than washing windows by hand. Despite the fact that you often need to change rags and move the robot from window to window. I recommend to buy for those who do not bother with the perfect cleanliness of the window. Got pros: Cleans glass well. Controlled by remote control. Low consumption of detergent Its cons: Slides off on highly important glass. It is necessary to change rags often, order spare ones. Leaves a small stain at the stop, which is easy to wipe.