The added weight of the mat is negligible, the thin thing weighs about as much as a sheet of paper, so no way it could damage the drive. I wouldn't use it if I thought it would. It is carbon and it lays atop the whole disc, minus the center hole, but doesn't stick. It's weird.
I could rattle off a line or two of audio-critic adjective cliches about the sonic improvements ... but I don't want to be one of those guys. Only wanted to see if anyone else here has tried it.
Kindly,
Mott