So I am having some issues with RC4.
I switched over to RC3 about a week before RC4 was released and everything was flawless. Easily the smoothest and most polished Rom I have ever used (even in RC form!!), so when I saw an update for it I decided to take the plunge.
So far here are my issues:
Serious battery issues, on RC3 I could go all day and then some on one charge but with RC4 and the same kernel (an 800MHz kernel) I can barely make it 3.5 hours. It is really REALLY bad.
Of course the camera issues that everyone else has already mentioned, along with a few minor redraw issues.
Basically the camera and absolutely horrible battery life are deal breakers. Since no one else has complained about battery life I am going to assume that it is a problem with either my phone or my kernel. I am going to go back to RC3 for right now.