Smooth performance when compared to iPhone 5S iOS 8.0 having some bugs hope it will fixed by Apple in upcoming updates 8.3.
Battery backup is also good when using 3G. Metal body is giving rich look. Same 8 megapixel rear camera with some new features like time lapse, fast motion.etc.
Screen is big. So just difficult to deal with thump on top Back button on screen.
But we double tap on Touch ID screen will coming down so it is good option to use.
Overall it’s great.