The adjustable head rest which was a key factor in my choosing this chair does not work properly. The screws could not be screwed in to allow for repositioning of the headrest. Too much trouble to return it and start anew.
I was able to put it together easily and it works well. The only problem was I could not for at least a week put the headrest on. I called support and they were going to send me another headrest. However I first screwed in the screws for the headrest most of the way removed them and then by laying the chair top on a bed was able to put the headrest on. Very good.
Easy to assemble comfortable office chair. I will say that if you are short this may not be the chair for you. Really like the adjustable lumbar support.