The chair is comfortable and ergonomic more so for the right sized person. I'm 6'0" with wide shoulders. I found that the armrests are a bit too close to each other as for me to comfortably use them I'm essentially only using the outermost edge. I also ended up just removing the headrest as any position it can adjust to would just dig into my shoulders.
So far so good...very comfy and ergonomic. Not sure of the life span of this one...my last chair (not this model) only last 2 years. Hoping for better on this.
I would recommend this chair because it is easy to assemble (only took me about 30 mins) and it is very comfortable. The price is very good for it too. Everything came intact and within the expected time frame too. Overall I rate it a 5 for being a very good experience.