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.
It is in our computer room we have a chair with costers on it and works well. I just wish that it was just a little bit heavyer as the chair sits on the mat with-any-one setting in it it leaves very deep impressions it the mat.
This mat fits perfectly under my home office desk and my chair rolls easily on the surface. It stays in place no matter what size person is sitting at the desk. It has a nice finish wipes clean with a damp cloth. I would buy the same again.
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!