First time I ever came across one was at my big local private gun show, this would have been 7 or 8 years ago, maybe a bit less. It was neat and he offered it to me at $400 but I wasn't interested.
I still find it neat, I don't really have a need for one, obviously neither of us knew the potential market upside of it years back.
One thing that almost cannot be argued, no matter how much emotion drives the discussion: Smith & Wesson made extremely little profit on these and there was a time where they could barely give them away.