I have a .380 DAO Backup.
It has been reliable, and although it is not a gun I would consider for concealed carry, nor be the first gun I reached for when it hits the fan, I would still trust my life to it if I had to.
I have had one issue with mine where the slide battered the frame just behind the barrel. I had to remove the mushed-up metal with some hone stones and polish it up again - this did not effect its reliability because I caught it soon enough, but, if let go, it would probably have caused the slide to bind.
I also had 2 factory "finger-rest" magazines split open along the seam, rendering them useless - I had to TIG weld them back together.
Things I like about the .380 AMT DAO Backup:
-Small
-Stainless Steel
Things I don't like about the .380 AMT DAO Backup:
-It's a .380
-It's too heavy! It was fine for its time, but better products have been introduced since.
-The 14+ pound trigger pull - my wife can't pull the trigger, it's too heavy of a pull.
-It can't feed hollowpoints like Winchester Silvertips.
-The confusing print on the slide that say "9mm Kurz". Most people don't know what this means (it's German for "9mm short") and someone could actually try to stuff a 9mm parabellum in the chamber thinking that it is the correct ammo.
All in all, there are other handguns out there that would be my choice before one of these - the reputation for reliabilty has been pretty spotty for AMT, with some years the company making good product, and then with other years the company making poor product.