If there's one thing I can say about the iPhone 4S it's that it performs really well. I don't have issues with any of my apps... they're fast and reliable, which is nice. I think that's why I was surprised to hear DBMandrake call iOS buggy! I do get the sense that apps are 'inflating', though - for good and bad reasons. They're getting ever more functional, more useful, increasing their scope. But they're no doubt getting more bloated and overcomplicated, too.