I rate this Ergo3D office chair 5 out of 5. The materials of construction are very solid and of high quality. Assembly was simple and took around 30-45 minutes. The chair is fully adjustable. I use the upright position when working at my desk. This position promotes good posture. I kept slouching out of my old chair. I think the Ergo3D chair is improving my posture even when I'm not sitting in the chair. The recline position is very comfortable when you want to take a break and lean back. It is easy to relax in that position. I am very pleased with this purchase and will recommend this chair to friends, family and work colleagues. Great job Nouhaus in the design and execution of the Ergo3D chair. I am a mechanical engineer and have no association with Nouhaus. Thank you, Jeff