I'm 5'9 with an athletic build of 200lbs. I've found that with sitting up straight in the chair has the headrest lower corners cutting into my shoulders. If you sit more relaxed it should be fine. I was able to put the head rest all the way up and back and it's mostly fine.
I chose this model because it was a slimmer fit than others on the Staples floor and it works well for my skinny carcass. So far so good tho its seat is a bit unforgiving compared to my last seat (tho not uncomfortable). Adjustments work well tho I haven't got the back as stiff as I'd like; it leans back ever so slightly. Overall a very good chair for a good price.
I have back & hip issues and this chair is amazing! Adjustable headrest height & back which allows me to lean back & rock to take the pressure off and provide relief! The mesh is breathable so doesn’t get too warm. Love it!