The Mercedes-Benz S550 is already a Cars.com Best Bet, and it took the prize as Best Car for the Boss in the 2008 installment of our annual Lifestyle Awards. Clearly, the biggest Benz deserved a full review for the 2008 model year, and reviewer Mike Hanley was just the man to do it. In terms of power and refinement, the S550 is at the pinnacle in its class. Plus, the interior is as elegant as it gets.