The Mercedes SL63 AMG, oddly enough, is a 518-horsepower retractable-roof two-seater for people who don't need to show off. Mercedes and AMG have taken the V-8 version of the SL luxury sports car in a more aggressive direction. The SL got a facelift for 2009, but still uses the basic platform that made its debut for the 2003 model year. The Active Body Control suspension provides a supple ride, but there's something disconnected about the feel it imparts during hard driving -- those heated, 12-way adjustable leather seats are loath to afflict the driver's posterior with rude news from the road below.