It's impossible to praise this feature too loudly. I don't know how many times I've lost a day or two of development because apps will only run on iOS devices that have permission from Apple's secret bunker. One guy wrote me saying the software wouldn't work on his phone -- it turned out he'd upgraded a week before. The old UUID in the certificate chain was worthless now, and everything had to be redone. It's not exactly right to say that nothing happens in the iOS world without a developer asking "mother may I" of Apple, but it's a close approximation. AppGyver's solution is a godsend for developers.