It's not that great. I've seen it up close and driven it - whilst it drives very well and is pretty original, it's had a lot of paint in the usual areas.
For £1500 it would be worth a punt but they're asking nice condition Highline money - not for an old 628CSi Auto. They've had it for sale for a year at least, and it's done the rounds of classic car dealers who are all trying to shift it.