@303Skier the iPhone 6+ has a optical stabilization feature that seems to cause havoc with the vibrations coming from the boat, which is transferred through the pylon and mount.
The app works but the video quality is very poor.
However, this seems to vary from different users where we believe boats with minimal vibration seem to work OK, but ones with vibrations from the motor and possibly shaft bearing vibrations the video becomes almost un-watchable.