Keep a Close Eye on Feedback
As you move away from your install, you'll want to remain vigiliant and continue to keep tabs on iOS 9 feedback for your device. This way you'll discover new bugs and problems as they emerge.
As time goes on, new iOS 9 feedback will emerge. We've already seen new and potentially harmful issues surface.
Keep an eye on Gotta Be Mobile for updated reviews, YouTube for in depth visual feedback on performance, and sites like Apple's Discussion Forums for feedback from everyday iPhone, iPad and iPod touch users.