This is a comfortable chair and very good value compared to
some office chairs I see at retail outlets that are way overpriced
and very uncomfortable. For the cost of this unit it is a great
buy and was very easy to assemble if you follow the assembly
photos. I can't comment on performance long term obviously
but I give it an above average rating so far. The only thing I 
would comment on is the seating could be a little thicker. 
Having said that the back height is perfect and the back support
is good and the fullness on the back is better than the seat. I am
sitting on the chair as I write this and I am very comfortable.
This was a difficult buy for me because I would normally want 
to see, feel, touch but my sense allowed my to acquire this one.