I also couldn't really get this to be useful... my problem is like Lyle's, I'm just seeing a list of all products on orders, but they're not grouped by nid or anything like that. So I have 15 entries for code transmogrifier, more for nunchucks, and so on. And I'm getting no results in the "Number of Purchases" column I setup.

So, as is, there's nothing to introduce to core, but I am curious to know how you're using this mod. What may be helpful would be to attach an export of your view that I can import and demo.