I have used Garmin devices exclusively for my bike and motorcycle for decades. But I am completely frustrated and fed up with Garmin's utter contempt and lack of responsiveness to the Garmin Express for Mac issues with my 840. The number of issues, including freezing, lack of connections, download and sync issues, is driving me up a wall.
For the first time I am seriously thinking of simply selling the 840 and just going with Wahoo. The only thing stopping me is that both my wife and I have 840 head units with Varia radars, so the sunk cost of Garmin, and the high cost of switching, will make it an expensive proposition. And Garmin knows this, which is why they are so unresponsive to their users. But I have about had enough.