How does iOS 9 run on the 4s? Is it worth updating from the now super-aged iOS 6? I'm on a 4s that's on iOS 6 for a week now (until I get my 6s+ next Friday) since my 5s charging port gave out on me, and there are some apps that I'm required to use outdated versions for because the newest versions aren't compatible with iOS 6. Should I just stick it out a week and stay on iOS 6? Or is iOS 9 worth giving up iOS 6 for?