I decided to save money and bought this flimsy mat. I see that the chair is already leaving marks that don't go away. That's why I retired the old one I had. It makes it difficult to navigate the chair when there are dents that don't disappear.
My chair sinks into the carpet leaving dimples in the mat that the chair gets stuck in. I am not that heavy 150 or so and the carpet in not that deep. If I had it to do over I would spend the extra $15 or so dollars and get a better quality mat.