The stalk is firm and holds it's position well. My only complaint is that the stalk is quite short, so if you mount it low on the windscreen the phone is quite far back. Mounting it higher on the windscreen blocks your field of vision, which I think is unsafe. I have mounted it as low as possible on the right corner, next to the A pillar and its less intrusive in your field of view.
I can't mount it on top of the dash as my Tiguan has a cubby hole with opening lid. Overall though, it is well made and does its job well.