The 2007 Mercedes-Benz M-Class generates more physical and visceral excitement than its predecessors, the pre-2006 models. From the emotional perspective, its front end is bolder, more interesting and more aggressive, with ventilated grille bars, a power-dome hood design and wild-looking integrated headlamps. In profile, the wheel arches loom large and prominent. There's an unmistakable character line rising front to rear, and a forward-slanting C-pillar that frames trapezoidal rear side glass.

On the practical side, the M-Class body is much more aerodynamic. Its drag coefficient, or Cd, measures 0.34. That's closer to the average sedan than the typical slab-sided SUV. The lower the number, the less noise generated as air flows over the vehicle, and the less power required to move the ML at a given speed.

Some improvements aren't readily apparent to the eye. A new-fangled scratch resistant paint, embedded with thousands of flecks of ceramic, is standard. It should be welcomed by those owners who actually decide to challenge overgrown trails, or those who share their garages with kids, toys and bicycles. There's an optional power liftgate operated with the key fob, and several cargo organizing devices available as accessories.

New for 2007 is the ML63 AMG, and it is readily distinguished from other M-Class models. If its 20-inch spoke rims aren't a dead giveaway, check the ML63's more aggressive front and rear aprons, unique grille, flared fenders and deeply sculpted AMG side skirts. The ML63 also features unique tinted taillights and two sets of twin-chrome exhaust tips.

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