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Zumo hands down! \\; I've got one on my '07 Ultra and love it. \\; Garmin makes a great product and provides excellent support. \\; The Zumo 550 comes with a motorcycle mounting kit and a cradle that can be used in you vehicle. \\; You won't be sorry! \\; Shop around on the internet for the best pricing.
If you compare the display of the H-D radio Nav add-on to that of the Zumo, you'll see the Zumo is hands-down better. And cheaper, with more features. The only possible advantage the H-D add-on has is that it's internal to the radio, and therefore more secure. I would recommend securing the Zumo in a Tour-Pak or saddlebag when leaving the motorcycle anywhere. A small inconvenience for a vastly superior product.
I thought about the HD system as well because I wanted the be sure the voice navigation would override the radio, or more precisely the CD player. But, the ZUMO also plays MP3's and the voice navigation does override the music, so I'm happy. Got a more visual system, it does exactly what I want, and saved a few bucks as well. It's easy to remove and take with you or lock up in the tour pak so security isn't really an issue.
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