Product is about 50% less cost than larger harder mat and was recommended for carpet of any depth on packaging. My carpet is about medium and the mat immediately got dents from the chair rollers. I am stuck in the dents all the time. It really is worth about $15 instead of [$] I paid but I do not want to spend $60 right now on the only other choice in the store!
The mat does the job. I had a previous mat bought from Staples and it was a bit thicker and a little easier to roll; apparently that product is no longer available.