The thing is, I don't want to stick anything to the glass, and my car doesn't lend many other places to put it.
I have a datalogging app on my TP2, keeping it in view while the car is running is useful.
This picture is a bit old, it was while I was swapping the instrument cluster. I have a couple of gauges on the a-pillar now so the small defroster vent is out of the question.
The center vents are in a great position - that's where I want my phone to sit.