Irrelevant information because I wouldn't suggest spending real money on one... but I drove my ex's mother's MY05 9-5 Aero Estate and was bloody surprised at the mid range punch that it had. Seemed well built enough, bit bland and the handling was a touch on the wank side and although they seem like quite a lot of car for the money.. I think I'd rather go for a Volvo V70 T5 or D5 if I wanted an older estate car.
Cheers,
Grant