FWIW, I used to plan out routes with the free version of RWGPS. It was fast and accurate. I couldn't do anything with it except determine the mileage, I would then have to remember the route, which wasn't a big deal as I have an internal Google map data base. I read maps at breakfast.

Then I went the whole Garmin route, swim watch, Edge 810 and liked the ability to create a course in Garmin and have it dumped via BT to the device. Pretty painless.

I don't do courses and TBT all that much (I have have that internal Google map database after all), but it works well when I need it and in truth, Garmin Connect is just as easy to use to predetermine that weekend warrior 40 mile road ride. Thus I'm hardly ever using RWGPS. Thus am amused by all the work needed to get a GPX or Tcx or whatever file over to the Garmin as I no longer bother, Garmin works just fine for my purposes.