Mine is a 2008 and up to 74k miles now. Its generally good. It was a motorway hack before I had it 60k miles in 4 years, so the front bumper and screen and quite chipped, so check for that. Also as an auto the discs and pads have had to be changed, front at the start of this year and the backs are almost ready to be changed.
One thing to consider with the diesels is that the DPF is a service item, so it will need changing at some point if it starts blocking a lot. I think I've read they don't get much beyond 100k miles, but ask Dave, he's a taxi driver so he should know. New DPF is about £1k.
Also you might be inheriting someones DPF problems, might be why they sold the car! They need to have been serviced on time with the proper 0w/30 low saps oil or the DPF might already by on the way out.
I wonder if its worth getting the fault codes read on a car you consider buying, to see if any DPF errors have been logged. Or have a word with t he dealer who serviced it, ask if any DPF problems have occurred?
