The 2014 Mercedes-Benz M-Class is a luxury vehicle above all else, and materials, ride quality and comfort are superb across the board.
The cabin experience is tight, quiet, and isolated. There's a rather wide difference between the two modes (Comfort and Sport) of the available air suspension and adaptive damping system, which play a major part in pairing isolation and control. Comfort provides more of a traditional luxury-car ride, while with Sport you get a somewhat crisper feel at turn-in, with a little more road noise and coarseness.
As you might expect in a Mercedes-Benz, the M-Class has excellent seats--well-contoured and soft, yet all-day supportive. There's space for taller adults in the back seats, too, although fitting three across will prove tight. You can however adjust the rear seatbacks, and even with them up and in place there's more than 36 cubic feet of cargo space behind them.
Mercedes made considerable advances in refinement and materials with its sedans in recent years; and with 2012's redesign it brought many of those improvements to the M-Class. And to an issue that's been criticized for years, the company has repositioned the turn-signal lever from the 8:00 position to the 10:00 position.
And thanks to much-improved aerodynamics—and a spoiler at the back of the roof—the interior is noticeably quieter than prior versions of the M-Class, or most other utility vehicles with this kind of profile.