I have only had this chair mat for a week but so far it is living up to the claim that it will support the chair and not dent in. It arrived in a flat shipping container.
This product is under my office chair (a high backed task chair)at my computer desk on laminate flooring. It stays put and allows for some control over chair movement (i.e. chair doesn't 'take off' or slide as it does on laminate floor.)
I wanted something thicker (stiffer) but there was very limited selection in any Staples store I went to so I settled for this one. It was the only one that would fit in my area. The thivker ones were all too large or the wrong shape. It works OK to protect the carpet but it's hard to roll the chair over it.