I bought this chair because it had a seperate adjustment for the lumbar support whereas most chair don't. You can raise the backrest to adjust the support on some chairs if you are lucky but then other parts no longer feel comfortable. This one was perfect. I didn't have to change anything else on the chair when the support was needed higher or lower on my back. I sit for close to 10 hours a day and this chair has per great for that.
The chair was easy to put together. I love how comfortable and flexible it is. It is also lightweight and easy to manage and works perfect for the space that I'm working in. However I have now been using it for a week and I am concerned that the 'seat cushion' is going to pull out of its frame. I've already pushed it back once. (Sort of like window screen edging)
This chair is very well built comfortable and easy to put together. The quality was a big surprise- at this price point I was expecting far less. Buy it!