Played with one for a while. Lots of fun, and being easily convertible to 9mm is a nice advantage. .....HUGE fireball from a 5" tube. I refuse to own a 5.7 till i can buy factory ammo because reloading that tiny case would have me throwing the whole tray against the wall and smashing the gun to bits in short order.
The .22TCM was annoying, but never really frustrated me, even putting the little bullets in wasnt bad.