For me it would be what has he replaced, for exmple, clutch, gear box, suspension problems. If he's spent as much on them as the rest of the car then it'd be worth a look.
My zed at the minute looks awefull after a few bad mishaps and jsut being unlucky really. However it's had a fortune spent on it replace a lot of things.
But then he doesn't say this, only way is to ring him or go see it