For what it's worth, I had an Edge 800 (pre BT) for almost a decade, and have had Fenix watches for several years. My stuff has almost always worked as advertised. Haven't used Live Tracking in a long time though.
It seems like their watches are more stable than their Edges. Mine only ever drops the BT connection when I go out of range, and I wear it all the time, not just on the bike.