I have or had the chair now about 2 1/2 years in office use. Quite apart from the generally rather poor processing (squeal of armrests, through SAT cushion after about 1 year, etc.) the chair yesterday even finished the endurance test, after the weld is broken at the attachment of a role and the role now enjoying her freedom. In my desk knowledgable now find nice bite marks. If a writing ink chair to max. 1 to 2 hours a week he uses is probably ok, but not for continuous use. Now I'm considering just for an expensive model from the retail trade.