This car is fun to drive, gets great gas mileage, and is by far the safest car i have ever owned (which has become very important to me with a new baby!). I have owned both Mercedes and BMW's in the recent past, and this car is more exciting, and has more cool features than either one of those! there is this thing call the BLIS (blind spot information system) that tells you if someone is in your blind with a light on the front A pillar... Very cool, and useful!
No problems after 135k. Rock solid car. Originally bought it for the seats because of a bad back. Reliability has been superb and fuel economy better than EPA ratings. Seats and leather are world class, and the ergonomic interior is nice. I've come to love the fuselage-like look and design of the floating center stack console. There are trade offs with everything, though. The ride is stiff. If you like the ride of a Honda Accord or the BMW 5 series, you'll like the S80. I'm in my car an average of four to five hours a day, and those aren't pleasant rides for road warriors. That said, I'd buy it all over again. The comfy seats make up for the poor ride quality and the factory Dynaudio premium sound system is amazing. I'm even happier with my car today than I was five years ago.
I purchased my S80 (V8) from a local Volvo dealer and overall have been quite pleased with the car. I didn't really consider any other semi-luxury vehicle, as I was a valet at a major casino in the past and really got to experience everything under the sun. However, be prepared to constantly be addressing small issues, this car is very finicky. Premium fuel is a must to avoid "mis-fires" cauing the check engine light to come on. The TPMS system requires at least 38lbs or it will activate. Rear-view mirror was recalled by Volvo and the new one seems just as bad (won't stay put). Also, this car should have Sirius and Bluetooth as standard equipment. Don't get me wrong, I would buy again!
I have driving Volvo cars since 1979. This is by far the best Volvo I have ever had, and I can also say the best of any cars I ever had. It run smoothly, sounds great (typical of a V8 with dual exhaust), runs economically and still have the necessary power when needed. I highly recommend it!