Chair was relatively easy to put together. It's super comfortable and easily can sit in for 5+ hours a day and be fine without all the aches and pains from sitting too long.
I have had the chair for about a month now and its great. I use it as my office chair and sit in it off and on for 8 hours a day. It took about 30 minutes to assemble while I watched tv and had no problems with the instructions.