Fair enough. Opt-in is way better that opt-out, or worse: not user controllable, and I hoped that was the case when writing my original comment. However, I was doubtful that the ramifications could clearly be explained and understood by most users. But, I haven't tried to do so myself, nor have I looked at the app, so I apologize for the strong stance.

As a user, and an iOS developer, I'm excited to have a supported, battery-friendly (intelligent?) system for allowing frequently used apps to update in the background. And this seems like a good fit.