I was pleasantly surprised at how comfortable it feels, especially on my lower back.  Also I must note how easily the assembling of it was!!  The tension knob helps to control that easily, and the flip up/down lever on the left side of the chair makes for easy lean back action.  What's nice is I can lock it in the non-lean back position or release it, both by use of the lever.  It has very solid cushioning in the lower seat, which was a huge upgrade from a previous chair I owned prior to this one.  My wife and I are very satisfied with the purchasing of this product!