Tried today to follow a ride on Trailforks through the Garmin--total disaster. Started from the right spot, but directions were terrible/rarely did it actually tell me which way to go at trail intersections (which were on the basemap, by the way). Closed the Trailforks integration in a fit, and loaded it through the Garmin. Improved somewhat, but still so-so. No arrows on the course telling you which way you are supposed to go, no direction at intersections (unforgiveable), but direction at major direction changes (hello, anyone there ever ride a switchback?)
Gave up, and navigated by blazes/general basemap.
I assume I'm doing something wrong, and sincerely hope so, but can't see myself going back to trying it for a good long time. Even my Magellan Cyclo worked better at navigating trails, and it was ~6 years old.