I used a mount simply to keep my phone somewhere besides my pocket, since I save battery by turning the screen off, it isn't to look at the display.

For the display, what I am usually interested in is on my Pebble that I wear on my wrist while riding (running Map My Ride on the phone). I just switched to a handlebar bag so I could carry my DSLR, and it has a clear map section on the cover that they have relabeled in the documentation as a cell phone holder so I keep the phone there, but again, I don't typically have the display on.