I'm now well over 500k in my 200tDi - it's had a few problems along the way, but most of it caused by my driving off-road.

As already mentioned, keep on top of the maintenance and they'll keep going forever in a day. The maintenance side of it is relatively easy (and there is a lot on this site). And it is a whole lot cheaper doing it yourself - I mean a WHOLE lot cheaper.

Cheers
Chris