The only real problem I had putting it together was getting the wheels to go in. Otherwise now that it's all together I love it! It's very similar to my office chair at work which doesn't exhaust me that's why I bought it.
I chose to assemble the chair opting out of the rather high charge for the store to assemble. Some drawings in the instruction booklet were not clear and some screws were bent and some of the threaded holes were off center so the screws were difficult to tighten with the included hex wrench. One couldn’t be completely tightened with a socket wrench.
I built this myself right out of the box with no trouble. I really like all the adjustable features and have been very comfortable sitting on this at my desk.