Wasn't too difficult to assemble until it came to the headrest. That was a bit difficult to line up to insert the bolts [had my son do it]. Note there are a loot of holes that are not utilized so pay attention to drawings.
Assembly was a breeze. It's comfortable in the way that a good office chair should be--I could never fall asleep in it but my posture is better and my back doesn't hurt at the end of the work day.
This chair was easy to assemble and very comfortable. We got excellent support from a Staples employee who helped us find the chair in stock at a sale price. Positive experience all around!
6'1 280 lb man sits comfortably in tiis chair . The adjustments allow to dial in some great positions to alleviate knee and back pain. Worth the cost so far!