I have a Xperia Z1 and the only issue I have with my P3P is follow me mode.  It gives me lack of GPS warning and will not work.

I know there is a list of approved phones, but does anyone have experience with either the Sony Xperia Z5 or the Sony M5

I would like to stick with Android and Sony when I upgrade in April

The Z3 is getting harder and harder to get hold off I have been told.

I had a Z3 , but now have a Z5 . Works great no issues at all .. Well the only issue every day I make sure that the dji app is not running or it will drain my battery if left on for hrs ..

Have you tested follow me mode?  If so, that's great news thanks :-)

I use Sony Xperia Z3+ and tablet Cube T7 & work great.