I didn't realize when reading description that pile vs. not would make a large difference. I have trouble rolling my chair and 'feel' the spikes when I roll.
product dents badly should have been twice as thick and I know it will crack and be useless in no time. On shorter pile carpet it may be better. My carpet is half to 3/4" thick. The reason I gave it two stars is Staples excellent delivery time. You can't beat it. I'm looking for a bamboo mat ant lay it over the top of this mat. Should be OK.