Brilliant car, the first generation S60. I still have mine (just a basic 2.0T though) and I still use it, despite also having an E39. The interior is the most ergonomic interior you'll find in any car, period. The seats are bloody brilliant. The engine is powerful enough for the car, sounds great and revs to 7000! The only downside is that it handles like a tug boat.
Other than that, mine is at 285.000 km, and it's still going strong. And it proved bulletproof and amazingly reliable over the years!