David,
I read your question and at first thought not to answer it because this library really is too vast to really explain in words without a long winded explanation that would still be in adequete.. Quite simply the products are complimentary of each other. If you have to choose one, I would get the demo cube. It can far out explain the differences (though it's only a glimpse) more than words. If you know a store or a composer in your area with VSL it would be most useful.
I read your question and at first thought not to answer it because this library really is too vast to really explain in words without a long winded explanation that would still be in adequete.. Quite simply the products are complimentary of each other. If you have to choose one, I would get the demo cube. It can far out explain the differences (though it's only a glimpse) more than words. If you know a store or a composer in your area with VSL it would be most useful.