Took me two hours to assemble - it was very hard to line up the screw holes in the arms pieces with the screwholes in the bottom to the back of the chair. I tried several different ways of positioning myself and the chair back before I managed to get it to work. (If the arms are screwed on tightly - as instructed - then the bottom of the back of the chair is too wide to slide in between them so I had to loosen them back screw on the arms to get them to allow the bottom of the back of the chair in between them.) ' In the end the handle that raises and lowers the chair and tilts and untilts the chair will only work for raising and lowering it - I can't get it to let me tilt the chair forward or back - so that functionality isn't working - which is very disappointing. Working at my desk while in the chair today is so much better than using the dining room table chair I was using - but I still wish I had that tilt functionality - since it's part of why I bought this particular chair.