As a dealer I've handled many S&W BG 380s but have never fired one. They appear very well made and we have never received a single complaint concerning one we've sold. Size wise they're on a par with the other micro 380s prevalent on the market these days. My only gripe, if you could call it that, is the laser on/off button. I'd much prefer a pressure switch on the grip, but the click switch S&W uses works just fine.
I own one and it's a reliable, reasonably accurate rifle. But as Dusty44 stated the drum magazine didn't work worth crap. The distributor traded out the 50 round drum magazine for two 30 round stick magazines which work just fine. I've read that BDM is making a polymer drum mag for this rifle that works as advertised, although I have no first hand experience.