Does what it says. Probably works great on low-pile carpets with no pad but isn't quite thick enough for my regular carpet with a pad. I still sink in.
Yes .145" of soft plastic will dent where the wheels are as common sense would dictate. I can't believe anyone would be surprised by this. I am just now having to purchase a new mat. I got SIX YEARS of heavy use out of this one on medium pile carpeting. That's well worth it in my book.