Chair was relatively easy to assemble but took me nearly an hour. It is comfortable and has very good lumbar support. Other adjustments seem good as well.
I'm 5'11" and because the headrest doesn't adjust height my shoulders hit the bottom of the headrest. A big bummer because otherwise it's a great chair.
Used to get terrible back pains from my old chair but this chair has definitely helped with reducing strain while working at the computer. The assembly isn't terribly difficult either so I'm very happy with the purchase