How does Garmin's auto-FTP work for you?
It's in all the newer devices, eg the 520, 820, and 1000.
I got a new watch with this feature, it's been telling me mine is on the rise, but it "works funny" (it requires a chest strap (https://www.firstbeat.com/en/consumer-feature/functional-threshold-power-ftp/)), and I'm curious what other...