Sony Xperia Z3 — Android Marshmallow for Xperia z4/z3+

Hi, I am a happy owner of a Xperia z4/z3+. My device still runs 5.0.2, my personnal choice.
Before getting de MM , I have another firmware here (still Lollipop). Just want to know from other people who have this device if it is worth to make the changes.

I know there are still some bugs, they will release updates for z5 e z4 family, but Stamina is the main reason to stay on Lollipop so far.

If you have this phone and can give advices, thank you....