The purchase is one of those "pay what you think it's worth" sort of deals, with a minimum price of $9.99. I had a moment where I realized that the soundtrack actually costs more than the game that it appears in--Shatter is available now in the PlayStation Store for $7.99--and almost backed away. But the soundtrack's good enough that I went ahead and bought it anyway. You should at least give it a quick stream if you're into this sort of thing.
Oh, and I'll have a review of Shatter next week, but my first impression is that it's pretty rad. Hopefully it stays that way.