cool or un-cool?

iv seen them on a few a4's they can work
 
I would wear them. But then I am a smoker. So maybe they would stop the rain from ruining my window buttons, and keep me a bit dryer.
 
These are making a big come back within the VW scene. I think you should go for it and be the first on here..
 
function wise they are great, i have them on my honda. Great way of keeping that car circulated with fresh air/ keeping you dry. How well they work in the Audi scene I dont know... id certainly give them a go on mine when i get it though.
 
I had these on previous cars. They allow you to have the windows open without getting wet or blown about. I've never bothered with any of my air-conditioned cars, though as I don't drive them with the windows open. So, on a functional level, they work brilliantly, if you need them.

As to whether they work as fashion accessories, I'll leave that to those who give a $hit about such matters.