So, I decided to invest some more euros and bought this chair.
About me: I'm 193 cm tall and weighing 105 ~ scarce KG.
The chair is very good, the tilt function is also very pleasant and the ass I can not detect any problems.
I work most of the day on the PC and can only recommend this chair. He is very comfortable on the back and as already described on the seat cover.
He would justify "my opinion" a little flaws of my assessment but no star deduction:
The armrest pads could have been, but that's a matter of taste I guess.
The chair is also very suitable for the summer.
Unfortunately, the roles are now in 2012, broke out of the frame, the first I have had new welding, but as for the next 2 month later broke out I opted for a new purchase.
While most office chairs look good but do not have a really good seating comfort and the armrests are usually made of cheap plastic and often seem very fragile. Even chairs in the 500 area often made no difference to the 150 models.
As I once again needed a new chair, I looked for futile furniture home visits on Amazon and am overjoyed that my "old" chair is still available here.