What I always say to my wife, Stiftung Warentest's like the ADAC (judgments from my own experience). As ancient technicians (70) in the following areas: electric, Electronics, mechanics, I can so easily no kidding. What interressiert me the internal processing, it is one of the effective power at the end of the hose. Because my wife had early problems with the enormous suction power. But this one has the regulator. And the mitbestellten vacuum cleaner bags have totally surprised me as allergies (this minimum price).