I did mat slides while I was at The Grand at Moon Palace in Cancun. Ooof, I can attest to how painful a wipeout is on those things! When I was going along the end straight away, somehow my mat moved from under me, I whacked my nose and back of my head on the side of the slide and I had a giant black and blue bruise on my back.
Oh, and I weigh 130 lbs for reference!