A local shop had them to try out, but I didn't make it over there. I like the idea. Maybe if the HPA ever passes I'll think more heavily about it. Until then, waiting a year to get a pistol you can't take the can off and put on another pistol? How about if you ever wanted to sell it? Gotta sit on it for a year once you find a buyer so they can get their tax stamp? Nope. I realize that's the same with suppressors and other NFA items, but you can't sell the pistol by itself.
I'll stick with my current cans that I can put on just about anything.