Great chair though have yet to sit on it for many consecutive hours. I assembled myself with no help and no need for tools (other than what was provided). Wheels need to be pushed hard into place...this was the hardest part. The I got all the wheels in except one...I had to very gently rotate a knife in the opening to shave off a dusting then it went in with some force (like the others).
I bought this in January 2020. Now in December 2020 I already have to get another chair because this one is defective. It cannot hold its position when I sit on it it sink all the way to the floor. And no it is not because I am a large guy.
So I really wanted to love this chair. I did. And I like it but certainly don't love it. Had I been able to shop in the store and have gotten to sit in the chair I would not have purchased it. The rocking back and forth (right to left) of the seat is annoying. The rigidity of the back: it is either way too loose (to let you lay back way too far) or it requires a 90 degree angle. Neither option is comfortable. Now I can sit on the seat for hours and hours without pain. So the mesh and support of the seat is nice.
Assembling with the included hex key required no more than 30 minutes. Assembly instructions & packaging were perfect. Comfortable chair. Lots of flexibility. Would highly recommend and would re-purchase.
I like the design of the chair and the mesh surfaces help to keep you cool but I find the mesh seat isn't all that comfortable for me - it has a bit of the "hammock" effect side-to-side so the edges are higher than the middle. This puts pressure on my hip sockets which gets uncomfortable after a while. I have kind of wide hips so this might not be a problem for someone else but it makes it so I have to sit on a pillow to relieve the hip pressure which is disappointing for a new chair (and erases the benefit of having mesh fabric on the seat.