This is a solidly built and very comfortable chair but just note that if you are over 6'3" tall the headrest is not quite adjustable enough to be comfortable. No matter how you adjust it kind of forces your neck forward instead of making a nice place to rest your head. That said for the price buy the chair and leave the headrest off. Its a very good deal.
I purchased two of these chairs and have had no issues as of yet. My favorite feature on the chair is the adjustable head/neck rest. I also like the sliding adjustable lumbar pad that can be moved up or down slightly to make sitting in the chair more ergonomically correct depending on your posture. I love that the arm rests go up for a better comfort at a desk or work station and go down to fit under a desk or work station. Overall a good chair as with other reviews with the duration of comfort "GET UP AND TAKE A WALK" every now and again. It is not good for anyone to sit for long periods of time they will probably find that no chair can accommodate that comfort level.