Make sure your apps are closed and that it's not updating automatically. It's improved the life of my battery. By now I am usually around 40%, still on 74%
Been messing with it more.
I have loads of games on it. They took several folders. Now in one folder. Instead of swiping across 5 screen, everything is on one screen. Bliss.
Occasionally I take something from a message and send it to someone else. Options used to be copy or speak.. Now easy send bits to other people.
Those saying ooh it's too bright. Turn it down. Very easy to do. The other option is to go for the darkest background you have.
Someone mentioned the search bar no longer searches the net for you. No but siri does.
Did you know the compass also acts as a level? No more having to rely on someone else to tell you if something is crooked before you hang it.
Audio only face time. Fab. Youngest likes using facetime. I hate the the thing, but use it first to get him connected.
Don't like how Siri talks.. He learns from you. Give him elocution lessons.
Hard to read screen - head off to accessibility - bold text - restart - your text will resemble io6
Someone mentioned it moves around too much - again in accessibility - you can reduce motion
Want to reduce ads - in privacy you can limit ads. Yes it's always been there, but in the past it was hidden elsewhere and something you usually stumbled accidentally across.