After reading all the glowing reviews, I decided to buy a window Auer from Kärcher. He already facilitates cleaning windows very. I welcome that you do get your hands dirty or wet almost impossible. Needless permanent creams of hands or wearing gloves while cleaning. Since practically no waste water drips on the window, you can work very relaxed and not have to have concern that carpets are dirty etc.. Battery lasts quite a long time ... at least so far always longer than I had the time and inclination to wash windows. Charging is quick. The cleaning attachment will settle super fast, comes into the washing machine, dries ratzfatz looking something out again, like new. What I had to find deviating from the glowing reviews is that you sometimes have to hurry to suck after wiping, since the disk is otherwise no longer wet enough and it squeaks during suctioning and then are streaks. Large wheels have to therefore in two or even three vertical stripes divide, otherwise a window part is already dry before you arrived there with the sucker. Therefore, a star less. Since I can not think of an alternative that makes it better still strong buy recommendation!