A very interesting post, srmd22.
I have updated my experience with these guns here:
Bodyguard 380: Finally Reliable!
Don't let the thread title fool you. I posted an update to my update when it turned out the information I presented in my original post was not correct. If you're patient you can read down and see the whole thread.
As far as a lot of the problems these guns have- FT Feed, FT Eject, FT Lock Back- these have all been repaired correctly on the first trip back to S&W for all three of my BGs. So I would not recommend having a gunsmith tinker with those parts of the gun.
The biggest challenge for S&W is fixing the FTFire. There is a lot more info about this, but no conclusions, in the other post I referenced.
That Sig is a nice piece. I just don't like single action pistols, as a personal preference/familiarity thing. And the Ruger LCP has a reputation for amazing reliability, so I know a tiny 380 can be made to work. I have zero loyalty to S&W or the BG; there is just no other pistol in its configuration. Believe me, I've looked.
David