Apprehensive, I absolutely love testflight. I've used it in every app I've worked on and I think they are an essential part of beta testing apps on iOS. I was looking forwards to using TestFlight live, and have it ready in apps in the store now.

I'm worried that this will dilute testflight, I would've much rather that it becomes a pay for product than be part of an ad network. It's not like they've got much competition, Flurry's analytics are difficult to use, Google Analytics is a hack -which is ok- but it doesn't work offline last time I checked.