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The G63 and its lesser-powered sibling, the G550, have neither the room nor the utility nor the efficiency nor the refinement nor the modernity of their GL-class siblings, but they have several things that the GL-class doesn't have, including character, provenance, and three locking differentials. If you've got the dough and the desire, I say, indulge yourself, but you might also want something a little more anodyne in your garage for driving excursions that require a bit more subtlety.