At my old workplace for years I sat on a duo-back and loved it. So I did not hesitate and buy me such a chair for home output. I chose a model without seat angle adjustment, as my old office chair had done even without his service. The non-adjustable seat tilt of new geliefeten chair was (and is) unverständlucherweise such forward sloping, that I slide down literally from the chair, if I do not wear high-heeled shoes or abstütze me with your feet on a footstool against gravity. Especially if I'm wearing a skirt and nylon tights, I feel like on a soapy slide and would be the one time or another nearly to the ground. I called customer service, one technician promptly sent, believed to solve the problem to assemble in one place under the seat some additional washers. Unfortunately, the thread is not designed for it and so constantly jumbled bolt, nut and washers on my floor, I again must assemble makeshift. Meanwhile, one of the screws is finally gone and the slipping effect back. I can not understand how one can offer a chair for more than 700 euros, to which one does not sit unaided (Me) can. The backrest is adjusted by the way, also, every time I lean backwards (sliding down) and must be readjusted (min. 15 times a day ...) annoying. If he had correctly adjusted, certainly a good chair.