I test drove the BMW 530, Mercedes-Benz E class, Lexus ES 330 and Audi A6. I had decided on the 5-Series but drove the Cadillac STS at the last minute and LOVED IT! It is a great car, feels sporty, but is large enough to comfortably accomodate rear passengers. It has so many bells and whistles I haven't had time to figure them all out yet. Incredible car!