Long considered the benchmark for full-size luxury cars, this version of the Mercedes-Benz S-Class solidly lives up to the model's reputation. The 2014 redesign offered a host of advanced technologies, while upping the luxury ante on many levels. The comprehensive suite of active safety features employs a battery of radar sensors and cameras. Features include active cruise control, lane-keep assist, forward-collision warnings and mitigation, along with attention assist to determine when the driver is drowsy.There is even an optional fragrance dispenser, which operates automatically at pre-determined intervals to keep the interior of the car smelling nice.A coupe version was new for 2015. A plug-in hybrid joined the lineup for 2016. Updates for 2018 include changes to the model names and their respective powertrains. The S450 is the new entry-level model, powered by a 362-hp twin-turbo V6. V8 and high-performance AMG versions are available. Convertible models are also offered.