They only had the blue version on display in the store so it's what I tried out. I wanted the black so they ordered it for me and it just arrived today. It ends up that the black has a completely different cushion type than the blue. The blue one has a typical cushion; whereas the black uses fabric tension. I specifically chose this one over another one because of the cushion type.
The chair was relatively easy to put together. It took under 30 minutes. It is a solid made chair. It looks good. It gives a lot of support. Since working at home all day now I have not had a backache once. It is not the type of chair to lounge in like my old chair. It forces you to sit properly since the seat is not that long from front to back. At first I didn't like that but now I see it is great for posture.
Was delivered in a day. It is exactly what I needed - it has adjustable arms lumbar and height. I have back issues and I have found this chair to be very comfortable!