I drop my iPhone in the door pocket and go. If I get a call it comes through the radio via bluetooth. I use the vehicle nav system.
However, I have a Proclip on my AC vent that I use for my HT Ham radios and based on that experience, if I wanted to mount my iPhone up near the dash I would use Proclip.
I run hot so I always have the AC going. I mounted the Proclip on passenger side of the passenger center vent and found it actually INCREASED the flow of cool air towards me and I can still operate the Ham radio and it does not block any of the controls for the factory radio/nav system.