Comfortable and well built. arms do not actuate back castors were not the best quality so 4 out of 5 stars. Best instructions I've used in a while. Fasteners are separated by number and sizes are clearly marked.
First the headrest did not fit. Pushed my head forward and was very uncomfortable. The there was a form cushion that fell off. Next the chair continues to sink to the floor. I have only had it for four months. I am a senior and it is very hard on my knees because I have to continually be fining the height. I sink to the floor almost below the height of the desk. Now I am dealing with the warranty. Sent the wrong size part. There is NO sticker on the chair explaining model number. This whole thing has been a mess.