Within 3 months of use this chair made it impossible to lean back without basically falling backwards. The main structure is the arms which form a box and connect both the bottom and back together. It is not strong enough and bends when you lean back. Eventually when you lean back you lean back even more... and more... and more... until eventually you can't lean back straight up and you instead almost fall backwards. I've had it replaced under warranty once. I decided this time to just donate the chair and write this review.
First I would like to say that this item shipped very fast also the chair was very easy to assemble and directions were very understandable. The chair itself is very comfortable.