I test drove a 2008 Quattro 2.0T with 52k kms on it. I drove it around the block returned to the dealership. The engine is very noisy (sounds like a diesel), the interior left a lot to be desired and the cabin noise was comparable to my Sonata 2.0T - in short, it was loud.
The dealer asked how I liked and I was frank - that was disappointed and simply expected more.. (the vibration of the steering wheel left my hands tingling for a good 30 minutes after the test drive) and certainly a quieter cabin/engine. He said that I should test the 2010 quattro, but for an extra 10k, I wasn't interested.
Drive the Audi you're thinking of getting and then make up your mind
I went with the 2009 e90 328i xdrive - and I'm not looking back.. there'll be no Audi in my future.