For 2007, the R-Class line expands with two new models. The diesel-powered R320 CDI eliminates just about everything bad associated with old-technology diesels except the outstanding fuel economy. The R63 AMG is powered by a hand-assembled 503-horsepower V8, with other mechanical enhancements that make it the undisputed hot rod of minivans (if the R-Class is indeed a minivan).

Yet the best news of all applies to the price. Perhaps due to slower-than-anticipated sales, Mercedes has lowered the sticker on other R-Class models roughly $5,000, without a significant reduction in standard equipment.

The R-Class has four conventional swing-out doors and a top-hinged, one-piece tailgate, like a station wagon. It has full-time electronically controlled all-wheel drive like many upscale SUVs, and it has three rows of seats, like the typical minivan. The R-Class is also quite large, though a good-looking wedge shape and sweeping lines help disguise its considerable size.

This grand sport tourer is longer than many full-sized, truck-based SUVs. Its doors are among the longest on any vehicle, and they open to expose a spacious interior that comfortably accommodates six adults in nice, supportive seats.

Whatever the R-Class is, we like it. Each of the four models accelerate, corner and ride like big luxury sedans, with the all-weather security of standard all-wheel drive and impressive flexibility for people and cargo hauling. All offer the passenger-friendly accoutrements of a mainstream minivan, including an abundance of cup holders and interior lighting and an optional DVD entertainment system. And all come loaded with passive safety features designed to protect occupants in the event of an accident.