The first chair I purchased had a malfunctioning piston. Had to return and exchange for another: both chairs squeak like a dog toy when you sit down. Not impressed.
So when you put this chair together it is quite simple but you are relying on the people who put the threaded inserts inside each piece to get them in the correct places mine were not. When I got this chair all together it is crooked and sits higher on the left than on the right. every part of this chair is uneven. The foam in the seat is higher in the front and not very comfortable on the legs if you sit forward in the chair. It also doesn't tip back at all even after loosening the tension all the way it doesn't tip back. I would return it but I really don't feel like trying to take it apart and fit it back in its box not sure if they would take it back all assembled..??
After sitting on different chairs I selected this chair because it is more comfortable and right size for me. I assembled it with no difficulty. Sitting on this chair for last several weeks I love it!