This chair choice was difficult to make, so many models that all look similar! I wanted one with a firm seat, not thin foam leaving one sitting on the board/plastic frame, this delivered that! I wanted adjustable seat positioning, this has all the seat adjustments my 40-year-old chair had! I am 5 feet tall, and the height adjusts low so my feet can touch the floor, most chairs don't do that! It is adjustable so if my 6-foot husband wants to use it, it raises high for his leg length as well. The seat moves forwards or back further assisting in comfort for the legs of the one using the chair. When I want the armrests out of the way it is just a squeeze of the buttons and they drop down where it feels like an armless chair, perfect if doing seated exercises. The assembly of the chair was a piece of cake! There is a video here in the comments on this web page showing how to assemble. Assembly time on the video is roughly 3 minutes it isn't that simple, in reality, it assembles with six hex screws and took roughly 30 minutes. Watch the video before and maybe during assembly, it is simple to put together. It is perfect for my needs, can't imagine a better chair anywhere. It works smoothly on hydraulics for height adjustment, the back has the mesh which I was worried about and there was no need, it is amazing to have airflow through the mesh! It offers just as much support as the solid back chair gave! The addition of lumbar support is very welcoming on a tired back! If you are on the fence about this chair or the taller back one, I feel it is worth the little bit extra to have the lower back version. I would give this chair 10 stars if I could, it is that nice of a chair.