I'm a relatively new BR fan, so I didn't have the original release of 'Generator'. I picked this up the other day, though, and it was really worth it. All the songs are great, and it even comes with 2 "alternative takes", of Fertile Crescent and Heaven is Falling. The alternative takes might even be better than the originals.
The best songs from this CD are, in my opinion, Generator (obviously), No Direction, Tomorrow, Heaven is Falling, Atomic Garden, The Answer (one of their absolute best songs), Fertile Crescent and Only Entertainment. This CD probably isn't for you if you have the original release, unless you are a hardcore fan that wants every edition of all of BR's albums. If you are a new fan, or down own a copy of Generator, I highly recommend picking this one up