It's a Mercedes and it holds up to it's name. I test drove the Range Rover, Infiniti QX56 and the Escalade. None of which come even close to comfort and performance. I opted for the GL320 CDI, which is the turbo diesel and for an almost 3 ton truck I get between 24 and 29mpg(The Escalade gets between 12 and 18mpg). The interior design is truly stunning and it has more features than you'll ever use.
The performance from the turbo diesel, 398 ft-lbs of torque available at 1600rpm!
The price is the only downfall of this vehicle. Fully loaded it was almost 70K.