On the meaning of window suckers I became aware through reviews only. Last was a product of Leifheit in a supermarket at a very reasonable price in the offer. Unfortunately, the device had but a mistake, so I made it back, but no replacement was since sold. I have to delve me then with the theme and am the more expensive the WV2 landed (but in a hardware store offer), I have not looked back since. The WV2 is compared to its predecessor, WV50 WV75 up, a little shorter, a little lighter and easier to use. Main tangible results are the sealing plug of the recovery tank and the on / off switch. Also, the air outlet is now cleverly solved. Compared to competing products, it convinces by its solid construction and the stable material. The unit a professional look, there are spare parts and also a narrower nozzle (from the WV50 ... 75) if necessary. Otherwise, I can confirm the positive experience of other Rezensoren and would like to dispense with repetition.