I bought this chairmat because it was advertised to protect my carpet and would be easy to roll on. I bought the smallest size so it would fit under the desk and a little ways behind the chair for good coverage. It does not lay flat on the carpet and I have sturdy very short pile carpet. Also the chair wheels do not roll on it. Instead they make grooves in the plastic and I have to physically get out of the chair and move it to where I want to sit each time I need to resituate. This chair mat is better used on probably tile or wood floors but definitely not carpet.
We needed something on top of our carpet where computer and desk sets. The constant wear and tear in the area was staining and ruining the carpet and sliding desk chair was hard to scoot about on. The mat has fixed all of this. Wish we had found this sooner!
I bought this mat to be used under my task chair at my office where I work up to twelve hours a day and sometimes 6 days a week. I have only been using it for a few weeks. No wear is discernible yet. My chair has five legs and has carpet casters. The chair moves very smoothly over the mat and easily moves back onto the mat when I go beyond its coverage. The mat is 46" by 60" which is the largest I could find. I could have used a 50" by 70" if it were available. My work station is surrounded by my desk a lateral file cabinet and credenza and a paper shredder. I constantly move throughout the day in all four directions. Before I had this mat my chair rode directly on the landlord's wall to wall industrial carpeting and the carpet was wearing thin.
Brought the chair pad home. Seemed OK but then I realized that not having a beveled edge is really important. If chair travels beyond the pad wheels can not negotiate the straight lip in order to get back onto pad. Have to lift the wheels over. Quite a pain in the neck. Also wheels make a fairly deep depression in the pad and chair does not roll easily. Should have purchased a better quality pad however store display only had strait edges in all price ranges. Will keep this one for a while but definitely will have to upgrade sometime in the future.