The CDs really are a prerequisite for any self-respecting kiwi-music-lover.
However, in this case you're paying an extra $60 or so just for the book. Yes, it's kinda cool and gives good insight to the songs, but not worth how much extra you have to pay.
Having said that, I got it for a mate living overseas and it makes for a special gift if you want something more than just the double CD.