Got this car as an Executive Selection rental from EWR. All-in price for 8 days ~$350 on corporate negotiated rate.
Performance: The car comes with a 2.5L, 5-cylinder turbo engine. The engine is rated for 208hp, 236lb-ft of torque, coupled to a 5-speed automatic transmission with manual override and front-wheel drive. The car has electronic stability control. Will run on 87-octane, but Volvo recommends 91 or higher. Since premium in NJ is cheaper than regular in PA or NY, it got premium.
To me, the car was very fun to drive - on a nice Sunday afternoon, I had to drive from NYC to Philly. I decided to take the scenic route (Deegan, Thruway, Tappan Zee, GSP, NJTP, PA Turnpike) to have some fun. 0-60 is excellent, at-speed acceleration for lane changes is good (since the turbo isn't too boosted, there's not much turbo lag), and the handling was good (although I was never in a situation that I really needed to push this).
Mileage: For the entire trip so far, I've averaged 24 mpg. Highway mileage has been around 26.
Amenities: Equipped with a leather interior, power adjustable driver/passenger seats with memory function on drivers seat. Dual-zone climate control, a good stereo system with an AUX input (located in the center console storage compartment), steering-wheel audio controls, power tilt-slide sunroof, heated seats, etc. All the usual features you'd expect an entry-level luxury sedan to have. 1 12V outlet in the front, 1 in the back of the center console. Mine did not have satellite radio, but that's ok because I've got a loaded iPod.
Interior space - this isn't the car if you've got a group to haul - with a tall person in the front seat, rear legroom is near non-existent. Trunk space is excellent. Front seats are comfortable, supportive, and have enough width for those of us who aren't tiny.
Overall verdict: Well worth it if the car's available. Since I'm new to National, I'm going to sample some other vehicles, but I can see this being a favorite. Based on past rentals of similar cars, I'd consider the S60 to be slightly ahead of either a Maxima or an Accord in terms of preference.