I can well understand the earlier comments about this compilation... nothing really 'new' or exclusive. However, I didn't have Tom Middleton's excellent Halcyon mix or Omen and Choice.
As an Orbital retrospective, it's pretty damn fine, though. My only gripe is that Lush3 and the Royal Albert Hall Live version of Impact are not mixed togther despite following one another on the compilation. When you've listened to the 'Brown' album as many times as I have, it's the only way to play these... but maybe that's just me (ahem).
Still, I'm editing the tracks together using Ableton so I have a pretty much perfect Orbital comp for the car!