It does also seem that there might be scenario where these 2 APIs would be used together i.e. use GeoFire to provide the set of geofence locations (using say radius of 10km)....and then Geofence API would notify when user is within say 100m of one of those locations. The question then is how best to "refresh" set of configured geofences as user's location changes.
Any advice about the ability to use GeoFire and Geofence in combination with each other?