Another (more than) satisfied 05 CDI owner here. Drove it 900 miles home from the MB dealer I bought it from. Only trouble so far in about 11 months of possession has been the front wheel bearings (but that's my own fault, see
05 CDI wheel bearing question), and the passenger seatbelt chime that thinks the seat is occupied even when vacant.
2,400 miles is a long way, but if the Carfax checks out I don't doubt the CDI will make it.