First heard about them from this review in TapeOp last year which was studio-oriented as all of their reviews are: http://www.tapeop.com/reviews/gear/102/red12/
Seems like just a gimmick though, and after reading what the builder has to say in the thread linked above, I'd be wary of them.
Agreed that these do seem like a gimmick and there are better microphones to be had. I also foresee it being an issue trying to bring them through airport security. That said, I know the reviewer, Joel Hamilton, through this band called The Giraffes and he's a very good engineer. While what we do is very different from being in the studio, and Joel used these mics in a specific application, I do respect his opinion.