Guess who manufactures that "more proven" H-D GPS unit...............that's right..........Garmin. The Harley units are overpriced, older generation Garmins.
I looked at going both ways. The Harley unit is not very visable, and can not be taken off the bike and used in a car or truck. My Zumo 550 has a windshield mount that will talk to you and give directions, It has a security mount system for the bike and it can be linked by bluetooth. I did not want to do that because I can read the directions on the screen and the screen is large and easy to read. Bldr