They seem fairly well-made, but one gripe I've heard is that if you dry-fire it with the mag out (or maybe even with the mag in?), the trigger bar somehow gets disconnected. There's some vids on YouTube on it, I believe. Kind of a weird deal, and if you don't know how to hook it back up or aren't comfortable disassembling it, it might require a send-back. Not so much as a design FLAW as much as a design quirk. Otherwise, they seem about as well-made as the NAA Guardian .380 and Seecamp .380, since it's pretty close to the exact same design (mainly with a different mag release button location, sorta like the Beretta 21A).
Are you sure about that weight rating? Last I checked, those things were HEAVY for their size because they're pretty much solid steel. Sure, it's easy to hide as far as its overall size and thickness go, but something that heavy could cause it to kind of "swish" around in your pocket while you walk if you carry it in your front pocket. That was one of the reasons I wound up getting rid of my NAA Guardian .32 ACP - well, that and the fact that by design it would jam on the last round of every mag - because even carrying it in my back pocket in a wallet-like holster, it just felt a little too heavy for what little it was. (And the .380 ACP Guardian is even bigger and heavier than the .32 ACP model, too.)
Then again, I could be getting senile in my old age of 34 years, so if none of the above applies, then please disregard this brain fart of a post...
Either way, $160 for a pocket-sized .380 ACP pistol ain't too shabby, as long as it's not a lemon. I do remember watching a video detailing the manufacturing process of those pistols and at least that part of the pistol was fairly impressive. I was under the impression that they (at least previously) retailed for almost double that $160 price tag, though. Master Piece Arms is mainly known for their MAC-10 copy pistols/carbines in 9mm and .45 ACP, and from what I gather they do pretty well in that segment, but this latest foray into the pocket .380 ACP market is somewhat recent, FWIW...