The angle is perfect, and I can easily make changes to my GPS, as it is in the Left Hand mode, which puts all the buttons to the drivers side. Very nice, never any glare (I would expect some driving to school in the mornings since my road goes directly east and west), always plugged up and I didn't have to try to route it anywhere.
Yes I have a disc (it came with the TT so I thought I'd use it) and it stuck very well, all I did was clean the area with alcohol, let it dry and then stuck it on.