Chair was easy enough to assemble with the instructions provided. The headrest if fine if you are a short person. I am 5'10" tall and with headrest fully extended the bottom grazes the back of my shoulders. I would hate to be a tall(er) person with this chair - would need to remove the headrest. Lumbar support is minimal and marginally adjustable. Chair is comfortable for what you pay but definitely not HumanScale quality.
I telework and am on my computer sitting for the most part of 8 hours per day. I tested many chairs and this chair is cool because of the mesh supports my neck beautifully and is easily adjustable.