Well, applying RC is simple enough. Everyone should try it. If RC sounds better, then use it. If not, don't use it like me, cpp, DenPureSound, Nuance, and some people.
Both PENG and I could not tell which was better - Audyssey On or Off.
But everyone should try it if it's available.
I'm just saying based on my experience, I wouldn't pay extra for RC.