When I move to a new OS I tend to forget the old one rapidly. My message notifications and Email notifications allow me to reply directly from the notification now and don't require that I open the specific app. I rather like that. My battey life was okay before and it's okay now but one change I've noticed is when I turn my phone off at night, it used to be 3-5% lower when I turned it on in the morning. Now, it's at the same percentage when I turn it on in the morning that is was when I turned it off at night.