So much anticipation, the exchange service from Amazon is perfect, even if you did not want me for a third time supply the part. But now partly. The idea is awesome and you can (when functioning) the stand highly universal clamping. Unfortunately, the first delivery (feet canceled) was directly damaged and the second delivery showed that the ceiling does not keep tension. When to pull the lever at the same time the pressure is built up for bracing. But the lever is not very high and jumped right back up. The stand is good in itself, and would also be fairly easy to handle, but the lack of functioning ceiling bracing it was not for me to use.
Addendum: 30.01.09 Amazon has the stand delivered me a third time (Top Service Amazon - hats off). This stand now works correctly in the first attempt. The quality of the closure (which the ceiling voltage then triggers) but could be better. Let's see how he does in the future. Under the present point of view I would give the stand 3 to 4 star.