/me has all the albums. I think the collection is worth the money, since the second cd is quite much only unreleased stuff and some live songs.
And I think they've gathered good songs on the CD1, so why not as an introduction to ZC. Of course compilation is alwaysw a compilation and misses very good songs and for the sake of money sometimes throws in songs that are hits but lack the certain aspects of a good song and/or are over played in radio...