I installed this version on the 6P and everything seems to be working great. All of the apps that I use regularly and have tested are also working great. I'm pleasantly surprised with how well it's working so far... I honestly thought I'd be switching back to M after I tried everything out, but I'm pretty sure I'm going to continue to use this as my daily driver, definitely seems stable enough.
I really like the changes to the notification window... quicker access to toggles and the ability to reply directly from the notification window.
Also, the changes to the task switcher are great... Clear All, multi-window, and double tap to quickly switch back to last app.