It will take a while to detrmine how good this mat is. I weigh aroubd 240 lbs. and my last chair destroyed my last mat. Unfortunately my receipt was illegible so I could not get a replacement. This one is a bit smaller than my previous one. The one I had at work was huge and indestructable so they are available but are probably very expensive. All I can say is we will wait and see. It's good so far.
The only "down" side to this chair mat is I feel it is a bit thin in construction. Chair wheels still make carpet dents but they aren't as bad as without the mat