My husband had this same chair for 1 year. I was envious and decided to finally purchase my own! Now we are owners of 2 Emerge Vortex chairs. It was really easy to follow the instructions. I would recommend asking someone to help set up the back of the chair only because it took some balance and strength to get it in place.
Very nice and comfortable chair. Assembly was straight forward. My only issue is particular to my specific situation....the chair seat height will only lower to 17" above floor level. My computer desk has a roll out keyboard and mouse shelf located 22.75" above the floor. This did not give me enough knee clearance with the chair lowered all the way. I ended up raising the desk brackets and shelf approx. an inch and a half to give me room for my knees.
Saw this chair at my local Staples and knew I had to have it. My office chair recently broke a wheel and I was using it until I got a replacement. This chair perfectly fit my needs. Its comfortable and the folding arms and height adjustment make it easy to adjust to your individual comfort level.