After testing BMW 135i and 335i coupes back-to-back, I can reveal that there are only two good reasons to purchase the smaller, cheaper car. Either you need a track day machine or you're an idiot. Otherwise, spend the extra bucks and buy the 335i coupe. The 335i coupe is more attractive, more enjoyable to drive, holds its value better and offers far more real road usability than the 135i. If BMW had made the 135i as a lightweight, no-frills, Bahn-burning turbo rocket ship, they would have created a truly unique, desirable automobile. But they didn't.