Same issue as others have had with foam compression. Did not take long to get a permanent indention and is very uncomfortable now. I would not recommend if you plan to use it 8 hours a day on weekdays. Didn't even make it 6 months.
I was looking for a chair that would be both comfortable and affordable. This chair has it all -- it is adjustable in all directions very comfortable and I no longer experience back pain after a day of work! I assembled it myself but I was surprised by how easy it was and it did not take too much time. I highly recommend it.
This purchase was a replacement for an identical chair purchased 4 years ago. The chair for comfort was the best of any office chair I had ever owned I am used to back tilt and height adjustment but the seat tilt was a huge plus. Unfortunately not long into its use a crack developed in the vinyl of the left arm rest. Then in two areas the back seat mesh came loose from the outer frame - the staples used were too flimsy. I fixed the arm with some duct tape the mesh with a staple gun (better staples than used by the maker). Over time the entire left arm had to be covered in duct tape. When it was chosen for admittance in The Creative Use Of Duct Tape Hall Of Fame I decided to retire it and buy new one. Still the same great comfort jury is out on the durability of the vinyl arms and back mesh.