I chose this chair because of the seemingly glowing reviews. Well, a chair that should've taken less than an hour to assemble ended up taking multiple hours. The instructions are vague and do not list the order that parts should be assembled, even though we discovered later that some parts absolutely couldn't be assembled before others. One of the screws does not bolt in all the way, despite numerous attempts. The piston does work and the chair is comfortable, but it was awful to assemble, and there shouldn't be screws that don't bolt in completely.