It depends. Personally, I'd rather have the music in the original format because more often than not, I'm going to want to hear more. I only have one 'compilation' and that's Sun Ra's Greatest Hits and I got that one because there is so much music, but over time I have bought a ton of Ra albums on Evidence and no longer need the album (although I can't seem to part with it either). For the novice listener, on the other hand, I see no problem with comps.