This article has destroyed me back .. It may be fine IF YOU DO NOT EXCEED 1.60m. Some finishing details make you laugh, as under the seat and staple worthy of a handyman Sunday but overall it is, for the price, decent article. I confirm the adjustment problems. Good editing is really not complicated but it is made difficult by the lack of precision holes. My advice is to mount the chair completely, including the armrests, BEFORE TIGHTEN ALL BOLTS, which will deal with them fairly easily, and also to provide yourself with a good key to ratchet Allen sockets, although more convenient than the gadgets provided to tighten the bolts. There are about ten years, I bought at a big furniture store high-quality chair made in France that I had as much trouble to climb, exactly for the same reasons (alignment of holes). This chair is not leather (for that price!) But quite a successful imitation. The chair goes up and down on a pneumatic cylinder and can block / unblock in "rocking chair", adjustable by a wheel hardness but beware, FILE IS FIXED: IT DOES OR DOES NOT RULE INCLINE HEIGHT. It's not too bad if you made less than 1.60m. If you are taller, nothing goes! The headrest is too low and you take it between the shoulders. Backache guaranteed. It is not possible to comment on longevity, the article is not "cheap" at all, it throws even more. Time will tell .. Conditioning is EPOUVANTABLE. The packaging is not designed for the mail and gets torn and patched. Inside the rooms are barely wrapped in plastic bags. Before accepting the delivery, it is ESSENTIAL to unpack, check if the seat is not scratched, torn or marked clippings, paint chips armrests, there is no shortage of couplings ( Me bolts were walking in the cardboard that had been partially torn .. and there is no lack any!). Otherwise, you refuse hop right away! So 4 stars if you made less than 1.60 m, 0 beyond. I suspect the manufacturer or retailer to liquidate a stock of unsaleable items due to this major problem.