We have glued down very thin carpeting in our office and the glue had given away causing ripples in the carpet. I thought the .85 mil might be too flimsy but was pleasantly surprised. These mats are surprising adequate for our use. We've just had them a couple of weeks so only time will tell if they will discolor with age.
Since I spend several hours every day on the computer I appreciate the ease that I can now move around in my office chair thanks to the great floor mat!
The adhesive sticker that is on the mat is not able to be removed easily. I put that section under the desk so I didn't have to spend time trying to remove it in its entirety.
It's not thick enough for plush carpet. No really--it isn't. Chair leaves big dents in the mat. What pushed me over the edge to write this was that I saw a 45x53 E.S. Robbins mat at the local C0stc0 today for nearly half what this one is going for! That one was rated for 3/4 inch carpet but looked every bit as thick as this Staples one and had a lifetime no-crack warranty. Next time I'll shop around more.