The cool thing about the RAIN experience is that they basically just play, with only minimal talking between songs, etc. so it feels like you are really seeing the Beatles. When I saw them last year (first time), it actually gave me goosebumps. Anyone that is into the Beatles gets it. They start out with the early years, and the outfits, equipment, and stage setup changes as they progress thru their career. You really feel like you are watching their career right before your eyes.
One other thing is the mannerisms. The guy that plays John is more playful, etc. early on and gets more serious by the end. Same thing with Ringo. He is bopping his head to the music, etc. and then more sedate by the end. Those types of things just make the show so much more realistic. I'm a pretty huge Beatles fan (the first song I remember hearing as a child was "Something") and I was expecting them to be good, but they exceeding my expectations. You can tell they are Beatles fans.