The garmin users just suffer from learned helplessness. Why complain when it's not going to fix anything? Wahoo gives hope, and then takes it away. My impression is the CS people at Wahoo know there are software faults and fixing people's problems just means waiting for the software guys to fix them. Firmware development is expensive, so it's not surprising that it takes a while to fix things. What's unconscionable is not trying to fix things, like Garmin does.
I have heard of a lot more hardware failures with Wahoo than with Garmin. Not sure if that's really representative, but I have never known anyone with a bad Garmin device. I know a couple of people with bad Wahoos.