A very large SUV, the QX80 has a plush, luxurious, and quiet interior. We liked the steady, supple ride but found this big barge ungainly. Not only is handling cumbersome in everyday driving, but the QX80 doesn't shine at its limits either. The seven-speed automatic and 400-hp, 5.6-liter V8 provide smooth and strong performance, but it chugs premium fuel and returned just 15 mpg overall. The tall step-up to the cabin makes climbing in or out an ungracious affair. Cargo volume is plentiful, and the small, power-folding third-row seat comes in handy to carry two kids. Electronic safety aids include lane-departure and blind-spot warning systems, and Infiniti's optional Backup Collision Intervention system. The new Nissan Armada is essentially the same vehicle, but costs less.