I bought one of the earlier 4" barreled ones when they first came out, and it would not eject the CCI cases. All other ammo fired and ejected just fine. When I contacted the manufacturer, I was told that the gun was designed around Winchester ammo, and that the CCI cases were too soft and swelled into the retarding dimples in the chamber and would not let go. I used a little jewelers rouge on a tight fitting patch and spun it in the chamber with an electric drill for a few seconds. that seemed to take the sharp edges off of the retarding dimples, and now it will fire any ammo that I want to feed it.
Now that Hi Standard is manufacturing it again, I see no reason not to purchase one.
They feel great in the hand, and are natural pointers in my case.
My CCW is also a AMT Back Up DAO in .357 Sig. While on the P.D. I started out carrying a .380 Back Up Single action, for back up and later on switched to the .40 S&W Back Up DAO, which has the capability of using both .40 S&W and .357 Sig with nothing more than a barrel change. So as you can see I do trust the AMT designes.