I was a bit skeptical about this chair at first, but after doing a lot of research I decided to give it a try and I love it! It immediately relieved my lower back pain as well as my hip flexor and hamstring pain. I had no issues putting it together once I reminded myself that product holes won't match if you tighten everything down as you go! You must remember this golden rule to assembly and you will be fine. I can see how this might not work for people with shorter or longer legs. For reference I am 5'8 with a 33" inseam, and it is perfect for me. Also, do your research on these chairs, they are supposed to sway from side to side, so they are not flimsy, they are meant to be this way, and I love it. It gives me so much freedom to move my back and hips and keeps my shoulders in a more natural position without having to constantly remind myself to stop shrugging.