I have a Thunder CC that I bought last spring. It is my summer carry since it is really slender and easy to conceal wearing just shorts and a T-Shirt.
The only problem I have had is with the WWB .380 ammo for practice, as they have a flat nose. They will sometimes hang on the ramp when cycling by hand, though once I have chambered that first round it always cycles reliably through the rest of the mag. But my PPK does exactly the same thing with the WWB .380's so I think it has more to do with the bullet shape than the firearm itself.
I use Golden Sabres for SD, but have tried Gold Dots and most of the other popular SD rounds and they all worked flawlessly. So I personally haven't had any malfunctions or problems, other than getting that first round into the chamber when using the flat nosed WWB.