2007 Mercedes-Benz GL-Class GL450 4dr SUV AWD (4.7L 8cyl 7A)
We've owned the GL for three months now, and it has been flawless. I've put 4,000 miles on it, with regular trips from the SF Bay Area to the sierras. It's incredibly solid and comfortable on the highway, completely stable on ice and snow, and easy to drive around town. The car is deceptive, there is a lot of room for both people and cargo hauling. We own this and an E-Class, and the GL feels even smoother to drive than the E. We tried all the 3-row SUVs and nothing on the market comes close to the GL.
Handling is super smooth and rock solid. The air suspension is great; after getting a foot of snow around the car (thanks mr. snowplow), I just turned on the air lift and drove right out, no problem. This SUV is hands down the best today.
The COMAND system is worse on the GL than on the other models. That weird little joystick is useless and error-prone. They should have used the simple arrow buttons as the E has. Only other improvement would be the MB DVD system. It is not very intuitive and the menu system is confusing.