But now to the weaknesses:
The chair makes loud sounds muffled when you move more. It seems to come from the direction of the rollers. The cross where the roles are tuned is made of aluminum and the pins of the rollers are made of steel. I guess the rub the steel pins on aluminum and cause this noise. I still want to order me parquet roles, then the pins are previously treated me tougher machine grease. If that eliminates the loud sound, I write in here yet.
Another weakness is the finest pimples on the chrome surface of the armrests. Here the welder worked unclean. If you clean the chrome parts with a cloth, fine fibers stick to the micro pimples. In addition, it does not feel good at when the chromium is not slippery. The welds have been ground down bad. The material was locally strongly rejuvenated. Luckily you can not see it and keep it well. Since you the armrests also touches times, some perfection would be appropriate there.
All in all a good product at a barely acceptable price.
EDIT: The new hard floor casters are a boon. The chair slides very pleasant there, but does not roll off the same with every movement. The thick goo machines on the pins has eliminated knarzen also. Now you can hear sometimes a very faint smacking of goo. This shows how much the game was there. Therefore my tip: give Before construction, thick viscous goo on the pins of the rollers! And do not worry, it can not get out drop and ruin the flooring. Since this annoying creaking is gone, I change my rating of 4 to 5 star.