Since I wore a hole in our old carpet I decided with new carpet a chair mat was a good idea. I would have preferred a heavier mat but didn't want to spend more money. This one will save the carpet but I've already made dents in it where I usually sit which means when I move the chair it wants to fall back into place. I'm still happy I bought this one as this is a problem I can deal with better than hole-y carpet!
I'm very disappointed in the mat. It replaced a much harder mat that I had for several years that was cracked. This new mat is not hard and the chair casters sink into the plastic material making it very difficult to roll my chair around. The chair was purchased some time ago from Staples. I will be returning the mat to my local Staples store for a refund as soon as I can find a suitable replacement.
Thus far the plastic floor mat is working well to allow maximum movement in front of our computer while eliminating unneccesary pressure from the rolling chair wheels on our new high pile carpeting.