We got one a few weeks back and found that the dimensions were slightly smaller than what it should have been, we sent it back (at great cost) to the supplier and have a new one the right size. For the weekend we used it, compared to the rubberised mat we've had for ages, we've given it a big thumbs up.
The biggest problem we've found with the rubberised mat is that it's got a high static charge, so dirt and dust seems to cling to it, whereas the C Gear doesn't have that. It also stayed wet for longer and encouraged condensation underneath; the C-Gear doesn't.
C-Gear all the way