I have a Sporster and Dyna so vibration is a factor that I have to consider when it comes to phones. I rattled one to death and my wife's phone suffered a fatality to her camera on her iPhone. They are great devices, just fragile in some respects with how small and delicate some parts have become. That's why I have tended to only mount a phone on my handlebars if I needed to see data in my FP3 App or was really lost in a city.
You and Hippo both meniton the Garmin Zumo, so I think I am going to look into tracking down a used one of those. I only plan on having it mounted when I do longer rides, so I don't much mind it not being built in.
Yep - so many dead phones because of rigid mounts. I don't want to risk it. On my Vaquero, it wasn't too obvious, but it was there. The wiring was all permanently mounted and hidden, so it was pretty cool.