Never driven the A6, but I drove the S4. It was the V6 Twin Turbo mill. When I took it past the Mazda dealer, I saw the salespeople stand up to look, so Audis are appealing cars. I enjoyed driving the car, and I know people that own the A4 love the car. The only complaint that I've heard of is the repairs. When I spoke with the Audi salesperson about the repair record of the Audi, he said "people who have problems will always complain, while those that don't have problems with their Audis do no complain, so the frequency of repairs is exagerated." It was kinda neat to be talking to a German guy named Otto about a German car, but his explanation didn't make any sense. I think that if you buy the A6, you'll enjoy it if you like to drive, but you should research its repair frequency. Just my $.02.