I've had this chair mat for a few days now and am using it on 3/8" Berber carpet which is what it's designed for. With my standard 5 caster office chair the wheels sink down into the plastic creating indentations. This makes the chair hard to roll around in as you have to get out of the wheel holes first. I'm not sure of this will affect the life of the mat. I expected it to be a bit sturdier. BTW I'm a 160 lb guy. Not a heavyweight.
Since I have been working from home since March I discovered a wear in our carpet from our office chair. Bought this to keep the rug from being ruined. Perfect fit in the area I am using.
The Carpet Chair Mat was a good size for my Desk . I doesn't like its shiny surface and too small spikes on the bottom. It is sometimes displaced along the carpet due to poor adhesion to it.