I flashed it on my 6P the day it came out. I'm rooted and running the Franco kernel, but on the stock rom with a few Xposed modules. It works great, and battery life seems to be improved... except when Google Play Services decides to go nuts. It doesn't happen all the time, but every couple of days or so the active bar on the battery graph will become solid and my battery life will degrade until I go to the Google Play Services app and force stop it. Kinda annoying. Even worse, according to my various battery and wakelock apps the worst offender is always the Google app or some other system app/process, which can't be uninstalled or greenified.
It's not that big of an issue, but it's annoying to have to go and manually force close Google Play Services every couple of days. However, battery is much improved when that doesn't happen.