They are not audiophile quality by a long chalk but not as bassless or tinny as you might think - at high speeds they don't stop wind noise as they obviously don't cover your ears but you can tilt your head to remove it from one ear at least. I wouldn't hesitate to recommend them, I've been...
I use Aftershokz bone conducting headphones - they don't plug your ears so external traffic noise can still be heard relatively well. I can hear cars behind me when on country roads and they fit easily with a helmet and can be muted quickly if needed.
Yes.
Heart rate data should all be visible on the edge in real time and all recorded on the connect app once the device has uploaded at the end of your ride. I normally use a hrm strap but if I don't want to wear it I can set my watch to send hr data to the edge, it doesn't send it by default...
If you don't remember these, here are the main features:
Almost the only lights available throughout the 70, the batteries would last around 3 hours if you were lucky. The rear mount would gouge your frame as your foot clipped the light smashing it into your spokes ripping the lens off and...
Google maps location sharing works on GPS alone without the need for a mobile signal - you will need to download the area first when you've got a signal.