I'm 6'2" and the adjustable neck piece isn't high enough. It sits under my neck in my back making it uncomfortable. I'll have to remove it entirely to make the chair work.
There are a number of bolts required to assemble it but that said it was a straight forward and just takes a little time. The chair itself so far is performing exaxtly as required. I use this chair for hours on end and so far no issues as mentioned by others. I weigh 180 though so can't speak for heavier users.
So happy with this chair. I am in this chair for 8+ hours 5 days a week and it’s super comfortable. My hips and legs no longer hurt from sitting too long. My teenage son had it put together in about an hour & had my old chair out with the trash. This chair is easy for me to adjust and headrest is a nice addition. I highly recommend purchasing this chair.