There are so many ignorant people who think that models of reality are the same thing as reality itself. In their MODEL of reality, they don't see how the CD mat could do anything, so they feel smug and think it's on topic for this thread to mock it. Pretty much the definition of sophomoric---that is, one who knows much less than he thinks he knows. I think most of these people are probably not older than high school sophomores, too---at least their poor writing skills suggest that.