The armrest surface is hard. Resting my arms there for a couple of hours I get burns and tingling. The armrest material has wear and tear within a few months/Rest of the chair other than the armrest is a good investment.
Instructions were amazingly simple. I did it myself in 45 minutes. Problem - chair is so comfortable and relaxing - difficult to work!!! Posture is much better and my neck does not hurt at the end of the day. Do not hesitate to purchase this chair.
My growing teenager picked it out for the ergonomic design and the cool mesh because he gets hot easily. He put it together by himself and was already using it when I got home. He loves it but I noticed he ended up taking the head rest out - perhaps it's too high for his current 5'6" frame. Looks good and sturdy though!