2009 BMW X6 xDrive35i

Pros

Precise steering, nimble, a real drivers car

Cons

Rear visibility is poor

I've owned this car for 7 months/12k miles. First, ignore the comment on poor gas mileage, BMW will tell you (if you ask only) that REGULAR/87 fuel is perfectly fine. My experience: 17.5 mpg/city and I drive the car in a somewhat "sporty" fashion. If you expectation is 20 mpg+ this is not the car for you. Note: On a weeklong trip I averaged 22+ mpg highway so given a 300hp/twin turbo drivetrain I'd say that's very impressive.
Absolutely zero car problems thus far - get the Michelin tires even if that means removing the deplorable Bridgestone Dueler tires - no comparison between the two.
Winter performance: Good to excellent. This is Buffalo and need I say anything about the winter weather. Comparable all wheel performance to Acura MDX (previous car) - almost but not quite as good probably due to the 18" low profile rubber. By the way - the Michelin's (standard) are all season tires.
Seating comfort/position: Near Perfect
Road/cabin noise: Negligible
Options: Heated steering wheel (excellent), fold down rear seats.
Net/net: If you can accept a 4 person ONLY SUV and appreciate the engineering genius of BMW and find 17+MPG around town acceptable you will not find a better car.
Final thought/Safety: Was in a near crash situation on a highway exit, rainy night, poor visbility. Car in front had gotten sidways and forced a 40+ mph evasive manuever on slick roads ........ the X6 was racecar precise allowing me to lock up the brakes due to a panic situation and still produced a controlled, no skid lane change! I am convinced that in most ANY other car there would have been a very different (and unfortunate) outcome.