I have a small frame. I enjoyed the chair at first but after using it almost two weeks while working from home I had lower back pain. The curvature of the seat messed with the alignment of my back. I'm returning in favor of a chair with a flat seat.
Great chair. Comfortable and easily adjustable. Probably the best chair for your money. Unfortunately mine came with a hole in the mesh seat. As anyone knows a hole in mesh will always get bigger. All I wanted was to exchange this for the exact same chair. If you order this make sure you inspect every inch of it before you put it together.