So far I have the Kärcher (the lending unit was the WV 50+) always borrowed from my daughter. After you have not given me the charging cable and the battery was empty, I thought so, .... itself is the man .... and got my own purchases. Tuesday morning ordered, delivered Wednesday around noon. Oh yes, I admit it. Since my wife sitting in a wheelchair needs and I now have to take care of a lot of work in the home itself, the number of "electrical helper" in the household is constantly increasing. But you have to be quick if you just also is incidentally still working. The Kärcher window vacuum cleaner is a real life saver. The time for the window cleaning shortened drastically. Mix liquid cleaner, assemble the device, spray, vacuum, finished. No wiping, no stripes or streaks. Perfect. It may well be that you can actually clean 25 windows with a cartridge cleaning fluid, at least Kärcher are at this. Unfortunately Kärcher is the size of the window not to, because the need to be out very very small internal Kärcher test. For us I managed 13 windows, plus two large mirrors. The mirrors of the battery has lost its power and then I had to reload. One could well pull off a star for that, but I lay it down in the five stars, because the overall benefits outweigh this shortcoming on. Strong buy recommendation. But is more likely to recommend the professional version for people with large expanses of glass.