Diesel reliability so far in Canada has been iffy. Firstly, the climate is too cold. Diesels at -20C and below suck. Actually in my experience after -10C things start to go downhill including the stability of the fuel.
The other problem is that they tend to be very expensive to repair. Although, I really don't have any experience with the small Euro diesels, the units here including VWs are usually expensive to keep running when they get past the 200K km mark. The fuel pre heating system usually screws ups and they are ridiculously expense.