The chair is very sound structurally, was extremely easy to assemble and conforms to my body very well. If you have a plastic mat under the chair, the wheels will leave indentations that one has to roll out of with movements, so purchasing a more rigid protective cover (over carpeting) would be advised. I wish it had a little more resistance when I lean back, but I am a fairly large person, so that may be expected.
I needed an ergonomic chair because of chronic back problems (multiple surgeries). This has great back support, adjustable. Arms are comfortable. Seat also fits well. Like the headrest