I have Beats PowerBeats 2 Wireless Connected to my iPhone 6s Plus. They work fine. When I start a call, the speaker button does not let show me the 3 output options as it should (iPhone, Speaker, Beats), it just switches the call to speaker. There is no way to get the call back to the Beats headset, without starting the call over again.
It appears that no AirPlay functions show Beats headphones either. Not in control center, or in music, although it will default play to them, but I can't switch back and forth between outputs.