I have an Apple watch (series 3) and use the 10k PRO app in standalone mode. I love it since I no longer have a bulky phone to drag around. I have a cheap pair of bluetooth headphones I have paired with my watch. I'm able to use 10k Pro and listen to music I have stored on my watch just fine. The voice and audio cues are a little weak, but I can still hear them pretty clear, depending on the music. There doesn't appear to be anyway to adjust the volume of these cues. As to the haptic feedback, I can feel it when its time to switch walking/jogging although I did have to tighten my watch strap a little more than it usually is to be sure. The only real problem I seem to have is that the 10k Pro app wants to be the dominate app when you look at the watch, so switching songs is a bit of a pain as you have to scroll back to the music app each time. Plus changing the music volume using the watch dial doesn't always work right when playing music simultaneously with the 10K Pro app, it works just fine any other time so I know it's not the watch or the headphones.