Update:
I have the sucker now a few weeks and am no longer satisfied! Initially everything was fine. For several days he sucks soooo strong that even with open "air damper" is the vacuum cleaner with a hand no longer operate. I have the bar with both hands by the flat cracking and am for a room already exhausted. In addition, it seems to me since that (because the floor brush firmly drawn on the ground only) to the dirt moves only forward and back. Something can there be wrong! I've searched everything, but discovered no errors or can not determine why he first worked well and now no longer ...
After the initial euphoria I am now unfortunately totally disappointed!