I have mounted my iPhone in the dash position for GPS usage and maybe the use of the app, although it's difficult to get the phone in a position where I can read it while riding, so I'm treating it as a "city navigator" which means I look at it while stopped trying to find my destination.
In any case, I discovered a nice side benefit, which is that I can use it to re-route the brake hydraulic line a bit, clearing up the space in front of the key switch which makes it easier to use with my gloves on.
