The stability is really good in itself. If you sit on it, you would never suspect that they could collapse now. All good .... until ...
... The holder of the damper. At first only ran away the right slot. One could at the time, however, already seen that the left already fragile (when the dark plastic is whitish already). After another two weeks then the second bracket was torn. And without that the box had been opened or closed. The pressure of telescoped damper was enough to have to tear the photographs of the screws. This is in my opinion the only real mistake. But he is serious.
Since I bought the Box in nem Hardware I still have the receipt, I'll try my luck again and get a replacement.