There are no major changes to the sixth generation of the legendary SL for 2015. The three versions from last year’s catalogue are back. Between the entry-level SL550 and the SL65 AMG with its 612-hp V12, there’s the SL63 AMG, which sees its power increase from 530 to 577 horsepower. Priced at nearly a quarter-million dollars, the SL-Class has no shortage of envelope-pushing technology.