Purchased for my home office on medium pile carpet. After 2 days of use there's cracks starting under the wheels of my chair. I'm under 150lbs and use about 6 hours a day. Quality is definitely not worth it.
I ordered Item #823767 Staples 36 x 48 Plushmat Medium Pile Carpet chair mat. It was ordered Monday night and was here early Wed. morning. It came folded in half with the prongs on the inside so that it flattened out easily within 1 hr. My chair rolls with ease. It does leave imprints from the rollers but that is minor. I am very satisfied with this mat.
This chair mat was easy to transport. Once I had it home there was no uncurling it started using it immediately. I use it in my sewing room it works great for me. I highly recommend this mat.