Just came off a Audi A6 3.2 quattro lease and decided to try the BMW 550i. I had a 2003 BMW 530i previous to the Audi. There is no doubt that the Audi quality and solidity is better than the BMW. The interior design of the Audi is superior as well. Where the BMW comes into its own is how it drives. The 550i is powerful for sure. The motor and suspension dynamics make the car despite is not being as solidly made as the Audi. We will have to see how the reliability of the car goes as the months progress. I never had any problems with either my 2003 530i or my 2006 Audi A6 quattro.
Great V8 motor in the 550i with nice exhaust note on my sport package model.
Obviously fuel consumption is not great with the V8 especially with any kind of spirited driving.