The earliest models are the most problematic, the RG10 isn't worth buying for over $50. The guns got better as they went so later guns like the .38 sp pistols are generally better than the .22 short ones. None of them are worth more than $100 or so out the door.
Most of the bad press about them stems from the Brady bunch due to the fact that Reagan and his bodyguards were shot with an RG14 revolver.
I've got two RG23 pistols that have always worked great but I've had an RG10and an RG66 (same model the OP has) that didn't last too long before problems...then again the RG66 had two previous owners that used it like crazy. The biggest problem is that the earlier RG pistols had very shoddy quality control. They won't blow your hand off but may stop locking up properly after a while. Basically they're a cheap gun made for the working man at very low prices and not really intended to be fired a ton. The RG66 was kinda like the Heritage RR of the Reagan days. This gun will never be anybody's pride and joy but they're not as bad as most people say they are.
RG23 short barrel:
http://i848.photobucket.com/albums/ab47/Myguns223/NewPictures020.jpg
RG23 long barrel:
http://i848.photobucket.com/albums/ab47/Myguns223/NewPictures017.jpg
RG66:
http://i848.photobucket.com/albums/ab47/Myguns223/My guns/RgModel66.jpg
Also don't believe the guy talking about how zamak guns disintigrate due to rusting. Funny fact about zamak is that with all of the things that make it inferior like the low melting point and its soft composition, there is one redeeming fact...it is more resistant to rust when compared to steel. The cylinders and barrels are more likely to rust than the frames due to this.