This thing is really cool. Thanks for posting the link. I am fairly interested, and may eventually pick one of these up. I wonder if the edges curl at all, or if it will lie flat. I would think the weight of it would help it lie flat.
These mats look fine and have been on the market for a while.
But as these mats are heavy rubber, postage of 70% for one mat (37$) and 55% for two or three (58$ resp. 87$) are killing this product for me, who lives outside USA.