This chair is a good chair. However the wheels on the chair are not smooth rolling and takes awkward movements to reposition. Also the lean back on the chair is way too soft. I don't like feeling like I'm going to tilt back in the chair just by sitting in it but even at the tightest setting the lean back is so loose. The feel and comfort of the chair are great. The armrest adjustments and chair height adjustments are great. It would have been 5 out of 5 stars if the wheels and chair lean were improved.
The chair is comfortable and adjustable allowing ergonomically sound positioning. We have two in our house and now my daughter has one. We like them very much.
Highly recommend this chair...I researched for a month and went to a Staples to sit on one and it really does deserve the ratings that it gets. Also assembly was easy...great instructions and easy set up. You don't need anything ... They give you an Allen wrench and that is all you need to assemble.
The chair came out of the box with loose pieces (preassembled arm pieces) and after 7 months has becoming really squeaky due to the loose/cheap plastic parts. I use this chair daily for work so if you plan to use sparingly it may be good for you.