Overall Q7 performance is above average, however just changed brake pads for front and balance rotation costing about $800 in just about 23K km on it. Had to take the car in to fix 5 times since bought the new car with all glitches like wiper, gas opener and extra engine oil, and I drive very normally and safely. My personal experience of driving M320 4-wheel drive benz, in terms of mechanical reliability, it is just too low. Maybe it is just my car, but annoying for wasting time to go for repairs etc.