Only issue is that the head rest is more of a Neck rest. I'm 5'10 (M) 176-180 Lbs The head rest doesn't go up or down much just the angle changes. still overall a great chair though. The seat is a bit aggressive in its curve at first buy it eventually stretches and settles down. Hopefully it doesn't breakdown we shall see.
The arms adjust up and down the tilt tension can be adjusted and of course the height. The headrest is also nice. The chair is very breathable. The sitting area does cradle your legs in a way that they are pushed away from the edges. It took about 30min to assemble while watching TV. Main reason for purchase is it was within the budget provided by my employer and came with good reviews.
My wife gave me this chair for xmas last year and I really like it. It is actually more comfortable than the Herman Miller chair I have a work which I would assume cost at least 3x the cost of this chair. I recently purchased a second chair for my wife and she loves it.
I went from working on the couch to working in the Hyken. This has been a hug upgrade for me. My only suggestions would be to be able to lower the arm rests just a bit lower and also be able to adjust the headrest more. I enjoy the headrest but unless I am slouching it seem to be at the perfect height where the bottom of the headrests sits right on part of my spine. I do really enjoy the chair though and so does my back!