I sit in a chair for work 6 hrs a day. My old computer chair made my back hurt. I purchased a separate attachment for lumbar support, but that made my back hurt worse. My first thought upon sitting in the chair was, this seat is hard. However its a comfortable firm hard. My husband put it together and he said it was fairly easy to assemble. I havent had to make any adjustments. Everything is at the right height. Im 5ft3, and I specifically searched reviews for chairs that were good for us shorties. I can even sit with my legs folded(Indianstyle)comfortably on the chair. I like having a head rest bc when I get those 1-5 min breaks I can lay my head back and relax. I highly recommend this chair!