MattN 
2007 BMW 3 Series Convertible 335i 2dr Convertible (3.0L 6cyl Turbo 6M)
Eats rear tires in record time.
 Between the wife and I, we have owned an E30, E36, E46 and this E93 BMW.  As with the others, when it works correctly, it is fantastic.  When it doesn't, it breaks your heart and wallet. First off, MPG is horrid.  Best we've had is 24mpg.  Coils go bad randomly, I've replaced 3 in a year and a half.  It's a lengthy explanation, but due to the direct injection, you HAVE to get the intake valves cleaned about every 30-40k miles, and it's about $1000 each time.  But the worst is the fact that it eats rear tires like nothing I've ever seen.  Like they are made of butter.  5000-6000 miles, max, and it doesn't matter what brand or treadwear rating they are.  Summer tires, All-seasons, doesn't matter. Nothing lasts more than about 6000 miles. I've owned this car 18 months, and I just vaporized the FOURTH SET of rear tires.  It sees 90% highway miles.  Unless you drive sparingly, or simply have unlimited funds to feed this thing, I cannot under any circumstances recommend this car to anyone.Update: the rear upper control arm bushings were jello, allowing dynamic camber and toe changes while driving.  Replaced with some adjustable heim-joint units and rear tires now last about 15000 miles. Which is still terrible but far better than the 5-6000 I was getting.