The chair mat was delivered flat which was good. It is fairly thin so light duty. Wheels from the office chair is already leaving indentions on the mat. I don't expect it will take long for those indentions to be permanent and make rolling the chair on the mat difficult. So I expect to replace it within a year which isn't such a big deal at $28.00 for the mat. However a heavier duty thicker/more rigid mat might suit you better … I hope this helps with your decision to purchase this product. Wouldn't want you to go through the hassle of returning it if you need something "more."
Chair mat came as advertised - heavy duty! The proof will be how long it actually lasts. One gripe about the mat I received is that it had a large sticker where the manufacturer and shipping labels were placed. It took me over an hour to get the dang thing scrapped off without damaging the mat.
I weigh just over 200lbs and this floor mat is not thick enough to withstand the weight of me in my chair: the chair wheels create divots in the mat at make it hard to roll out of them smoothly. I will be returning and hopefully finding a thicker mat to use.