I've had an S2K for 6mo./600 rounds, no malfunctions at all. Shared 15 & 33 rnd mags with my G19. These two are my ultimate SHTF/BOB pair. I can probably group the S2K as well as the G19 at about 2 or 3 times the distance. I think fine for 2 legged creatures up to 100yrd. Longer barrel adds 200 ft/sec which starts to approach .357 handgun power. It's the ultimate travel firearm as it has long gun legality, but is almost as portable and inconspicuous as a handgun.... it goes with me when I cross state lines where my CCW is not valid. It fits in a laptop case and stores it my handgun safe. Downside.... it's a dirty shooter (blow back action).