I am a HUGE fan of the AMG and M performance brands provided by Mercedes and BMW; when I went in search of a powerful German Saloon my top picks were the BMW M6/M5 and Mercedes CL65 AMG edition (not even considering Audi at this point). After test driving both the Merc and BMW, neither of them had the full package i was looking for. After test driving the S6 it felt more stable on the road than the M6, and more powerful than the Merc, and substantially more luxurious than both. Its been more reliable than a wood burning stove, and with a Lamborghini Derived V10, I never feel short on power. I LOVE my S6!