When the BMW dealer handed me the plastic fob, he insisted I drive the 335i Convertible with the top down. Despite the cool, foggy San Francisco weather, I held the plipper's unlock button down and watched the show. As the hardtop began its elaborate three part dance into the trunk, I felt that old familiar flutter. The feeling was born when I started driving lessons in my Dad's 1963 Chevrolet Impala rag top, survived my first car (a 1962 VW Beetle convertible) and lead to my current stable of drop tops. Would the 335i live up to its predecessors?