No, I haven't seen the full version edition for less than $249.00. Yes, IMO it's worth every penny!
Funny, because I was looking forward to purchasing the remastered Beatles CDs (which I did), and Beatles Rock Band wasn't something I was interested in buying. Knowing that I'm a huge Beatles fan, DD19 convinced me I'd love the Beatles Rock Band, so we went to
Best Buy to check it out. We tried out the game that was set up for demonstration, and I was hooked! I purchased the entire package for the Wii. ($249.)
I've never played any of the other rock band or guitar hero games, and probably never will. So, I can't make any comparisons to other games. I love this one because it's the Beatles- their images, their music and their story. I'm not at all musical, so I've been playing everything (guitar, drums, singing) on the easy mode, so I have a long way to go with this game!
My family and I have been thoroughly enjoying Beatles Rock Band, and everytime friends have been over, it has been a big hit.

I tend to hog the drums. Love playing them!

I would think any Beatles fan would really have a lot of fun with this game.
You might find more information on this thread, also:
http://www.disboards.com/showthread.php?t=2277420&highlight=beatles+rock+band