Assembly was easy. They have individual packets of bolts/screws labeled for each step. This replaced my same model chair without the higher back. I got this model to help reinforce improving my posture. No issues with spending a full day sitting in this chair.
The chair is comfortable in seating the back support is awesome which keeps your spine in correct position. Easy to setup and finally the with the money.
The chair gave me extremely bad lower back pain after a few days. It was the only thing that had changed in my life so the chair had to be it. Returned it.
Hard to assemble. Couldn’t use the headrest pinched my neck. I have to come up with alternative. More comfortable than my last chair I would rate chair a 3 but for some reason it shows 5 stars and I can’t change it