This particular chair feels nice sitting in it. I gave this chair a 4 and 1/2 rating due to it leaning to the left way too far for my comfort. For some reason I am not able to correct this at this time. But overall this chair is great.
Everything thing you need to assemble the chair is in the box. No extra tools required. The chair has a nice look and feel. I work nine-hour days and it's comfortable enough to sit through long stretches of work.