This is a comfortable manager chair and I would recommend it with reservation. The chair is substantial, will accommodate a big/tall man of girth, it adjusts, casters work properly and it was simple to assemble. Having said this, an important part of the chair isn't available from the manufacturer and it's quite difficult to locate elsewhere it is a headrest for the chair. Office Star Products doesn't make a headrest for the model 5500 and that is something you should take into account when purchasing this product particularly if you're interested in ergonomics having lumbar support, back support, and head support (which is important for complete/proper alignment). The missing headrest renders the chair only 50% useful for ergonomics. I would have given this chair a higher rating if purchase of an optional headrest was available or the chair was manufactureed having with it. I would have paid more for the model 5500 chair that has a headrest.