My use model is to import routes from RideWithGPS directly to the Wahoo, then at the end of the ride push the tracks back up to RwGPS as well as Strava. This can be done directly over WiFi or tethered through the Wahoo phone app, with no desktop PC needed. From what I've read, the Garmins can push tracks up, but not pull routes down (except from their own cloud service). My understanding is that the only officially supported method is to export the RwGPS route to a TCX file then copy it to the Garmin via USB. There's a third-party ConnectIQ app called dynamicWatch which I *think* can sort of replicate the use model of the Wahoo but I'm not sure.