Yeah, well all it actually seems to do is: 1) Keep grease from exiting the pizza, and 2) Cool the pizza faster than if you had served the pizza on anything else, thus making the pizza look old (and cold) after about five minutes out of the oven.
As someone who owns one, I'd say if you're really interested in these things, start off by buying one. Just one. If anyone wants one, and you intend to be around central Ohio at any time in the future, come and get your free 16" nibbed serving tray.