My Diamondback 380 has had zero failures in 200 rounds. Just look for serial numbers above ZA 2XXX they worked out the bugs by then.
Seen this posted many times by different people. I then tell that person that my "ZC" series which is way past that mark had constant trigger reset issues after only 50rds. It fed and ejected everything fine but on top of the reset issue, the trigger was just way too long with equal reset. Mags barely popped out of the grip when ejected.IMO the DB380 doesn't hold a candle to my flawless P238 even when the DB did work. Big sights, almost no recoil, flawless function, short trigger pull and reset, mags pop out with force and Sig actually fixed the problems with the recoil springs and magazine follower for free that where issues when it was called the Colt Mustang.
This new 9mm version just looks like a bigger DB380 so I'm guessing the internals are identical. I'd rather go with the Kimber Solo with an all metal frame, SA trigger that is not nearly as long as the DB and from a company that will actually fix any issues they have.
BTW, Colt is coming back out with the Mustang with zero changes to the outside. Internally though, I'm sure there are Sig fixes galore.