Regular X5 x35i owner, but I just recently bought a 2011 335d with 60k miles on it (still CPO for another couple of months.) The CBU cleanup was done under CPO at about 54k miles.
I am definitely enjoying the monster torque that the engine puts out. Decided on buying a diesel after having a 535d as a loaner for a week, and really missed the 2007 E90 that my wife had for a few years, so it only made sense to go with 2011 335d to get it all!
Anyway, I am interested in learning about any issues that diesel engine might have, especially since this is my first diesel car and I really don't know much about them. Will keep an interested eye on this thread and any other diesel related threads.