A little expensive but seems to be good. My carpet & padding are at most .5 inch thick..Chair rollers do leave small impressions. Time will tell! Delivered on time. Mat was received with 5-6 bent edges from how it was standing in delivery truck. It took about 4 days with heavy books to get them to lay flat. Maybe store pick-up would be better but in convenient.
I use it on a berber carpet and it grips fine and stays there. However it only lasts a couple of years and cracks all over. Not terribly durable. I don't know what "limited lifetime warranty" means.