I bought this for use on standard household carpet even though it's intended for office grade. It was really too soft for that home carpet. But didn't want to spend the $$ on a thicker grade. Placing office grade carpet tiles underneath the mat solved the problem (the mat actually holds the tiles together). Works great now. Have no complaints whatsoever.
It makes rolling my office chair easier than on carpet alone. But the chair wheels indent the plastic surface easily making rolling uneven. My first mat broke through after less than two years.
The size price and look of this mat is great. The only problem is that it doesn't hold up long enough. It gets big cracks after a short time and I am on my third one in 5 years.