With a good bit of its structure built out of aluminum, the 2014 Mercedes-Benz S-Class feels light for its size as you maneuver it through its paces. As quiet inside as an empty cathedral, the new sedan also feels stiffer – in the positive "moving-as-a-single-unit" way. The ride of the standard S-Class's Airmatic cushion-of-air suspension with adaptive damping is even – firm without being jarring and comfortable without slurring drunkenly into corners. The S550's twin-turbocharged V8 engine is a model of healthy acceleration, smoothed out into elegance with the help of its 7-speed automatic transmission, which engages the now nearly ubiquitous fuel-saving stop/start feature (the engine shuts off when you pull up to a red light, starting again when you lift your foot off the brake pedal). If you need your S-Class to breathe fire, the 2014 S63 AMG 4Matic or the 2015 Mercedes-Benz S65 AMG (621 horsepower) will endear.