You got a good deal. They are nice guns. They are part of the original "Elite Series" from Beretta. I purchased one in 1999 and wish I never sold it.
The Custom Carry is basically a Beretta 92FS Compact-L (4.3"bbl, 13rd mag) but with a single side safety for better concealment (so they say) and a billboard on the slide.
I'm not sure if there was any internal improvements but I don't think so. All the compact variations of the 92FS have been discontinued, and this version is even harder to find. I think $500 is a good deal, particularly with the mags.