They don't appeal to me, but some folks seem to like that sort of thing. As with any other mag of that sort, how well it works is a function of how well it's made. That one doesn't look bad, but you never know until you try it. $55 seems like a lot to pay for something that's basically just "Kewl Factor," but different strokes, etc.
You probably could get a VA dealer to order some for you, if you really wanted them.