Very flimsy mat. It would work great on surfaces without any carpet at all. Our low-pile carpeting makes the chairs sink in and put grooves in the mat. It's just a matter of time before the chair rollers break through.
I was able to get this mat for [$] after the half price sale and a Staples rebate card. Otherwise I would not have bought this mat. Within the next year or so it's going to crack into miniscule little pieces. Hopefully by then I'll be in a position to buy a $70 chair mat. Unfortunately Staples doesn't offer an in-between.