That depends what you've been buying. Off the top of my head the big advantage to Google is the ability to track behaviour patterns before spending (and match

That depends what you've been buying. Off the top of my head the big advantage to Google is the ability to track behaviour patterns before spending (and match them to similar patterns that didn't result in a purchase and look to modify that behaviour). While I don't think that's a big deal, I also don't see the benefit to me in giving it to Google. Maybe that will change when I see the full service offering but from what I know at the moment this feels like I have a potential loss (privacy) and little or no potential gain. On that assessment I wouldn't go near it.