In overall size and room, the 2010 ML-Class is more than competitive with the likes of the X5, Cayenne, and FX.
All versions of the 2010 ML-Class share a common five-seat cabin layout-and standard vinyl seating, a noticeable dent in its equipment list, in our opinion. The front and backseats have good headroom. There's plenty of adult-sized space even in back, though a third person wedged in the middle might have good reason to complain about the lack of shoulder room.
There is no third-row seat option; that's the job of the larger GL-Class ute or the hefty-looking R-Class crossover, which also shares its architecture and assembly line with the ML-Class. With the rear seats folded down, cargo volume is 72.4 cubic feet; it's 29.4 cubic feet with the seats upright.