It's great to see an example that actually produces a full running app. There are lots of little things involved in making an app that get missed if you just talk about directives and scope.
Will be interesting to see how easy it is to get the same project working on mobile, hopefully with minimal changes :)
Looks nice. I think collection price and track price might be reversed on the example site, though. Track price for one was 11.99, where the collection was 0.99.