I just assembled this ergonomic office chair the other day without a problem. The lumbar support and neck support are superb, it has a good balance for my back and the arm rest positioning is quite customizable. Lumbar support is pretty supportive with its unique mesh and strong curvature. The mesh is very strong and does not feel like it can rip.   The chair is very easy to use in adjusting height, tension, and armrests, and it's very comfortable to sit on.  The price was very reasonable and the features of the chair meet all my requirements.