As the young people I encountered explained during my week with the car, the Speed Convertible and its 205-mph Coupe sibling are favored by entertainers and athletes. Apparently, the button-down money goes either to Bentley’s top-of-the-line Mulsanne or to one of a variety of Rolls-Royces. Makes sense. The Speed Convertible is an athletic car that wants to be driven. Its 6.0-liter W-12 engine makes 590 pound feet of torque between 2,000 and 5,000 RPM, rendering its 5,500-pound bulk as invisible as a magician’s rabbit. Zero-to-60 happens in just 4.1 seconds.