iOS 9 is Apple's more intelligent, more polished operating system for iPhone, iPod touch, and iPad.
After the radical redesign of iOS 7, which gave us a cleaner, more flexible experience, and the functional revolution of iOS 8, which extended and continued that experience between apps and devices, iOS 9 takes a moment to solidify and round-out everything that's come before, and start us towards everything that's coming next.
This includes making Siri and Search broader and more proactive, expanding Apple Pay, rebuilding Notes, adding transit to Maps, launching a News app, enhancing the QuickType keyboard and bringing multi-app multitasking to the iPad, amping up performance, extending battery life, tightening up security and privacy, and making the update process much more efficient.
Absent the radical and the revolutionary, then, iOS 9 has to deliver on the promise not of more but of better. After the giant leaps, it has to stick the landing. So, does it?