I had the secondary phone running 15.1 with me all the time during the course of last week and used it for almost everything I normally do on my main phone (except messengers).
General observations
- Battery consumption seems about the same as with 14.1 for my pattern of usage. I would say it looks like a bell curve with peak around 1.5 days with rare cases where the battery only lasts slightly less than 1 or slightly more than 2 days
- I haven’t really used the built-in apps, so I can’t comment on them
What I like/has improved
- Now one additional row of app icons on the home screen by default (and can be configured)
- boot time seems slightly reduced
What I don’t like/has gotten worse
- In 14.1 when tapping the “energy save mode” icon in the quick launch area it used to open an “overlay” (not sure if that is the correct term) that also showed a graph of the battery consumption. The quick launch icon now is just a toggle and to see the graph from the battery settings a lot more taps are needed
I guess I need to check what is new in Oreo because I feel I didn’t notice much difference