well, diesels have their good points and bad, some love em some hate em. they are still relatively unrefined and quite noisy at tick over and sound a little rough on the ears obviously. once moving theyre as smoothe as petrols generally. the small rev band is too frustrating for some but these days most have bags and bags of torque. the 335d and 535d are hugely fast... like sitting in a spring and sheer grunt from nothing. much cheaper to run (day to day) and supposedly longer lasting due to stronger cylinder walls and waxy fuel ....errr so long as your turbo or manifold doesnt blow/let go. i think most enthusiastic drivers still prefer petrol though.