I have used the Edge 1030 for road and MTB cycling, and now bought a Forerunner 945. When I record a bike ride with both devices, Garmin connect does not notice that both devices are in fact recording the same activity. So afterwards, I have two rides with almost (but not entirely) the same data. Funnily, the estimated recovery time and training effect is much higher on the Forerunner than on the Edge.
Do the units not synch or communicate with one another? They are linked to the same Garmin connect account.
Alex