I haven't tryed this one but I have a few suggestions.
First of all I think all the vent mount are kinda hard to move.
It's so stuck into the vent that I have trouble taking it off.
Second i would recommend you to take a look at
www.semsons.com.
They have a lot of solutions and many are actually cheaper and nice.
I'm coming out with a review for the Arkon powered anyday.
Nico