I've seen them about a year and a half ago. The reviews/comments or what ever it was didn't seem to portray it in a glowing light. Sorry i can't offer up more insight than that.

I'd be interested though in hearing from someone as well. I kind of look at it this way though, if it was something really favorable, you'd see them around on a lot of guitars. I've never seen on other than on the internet and that was only by chance.