This Infiniti SUV mostly succeeds at providing a sporty driving feel to match its sleek styling. Its highlights are an eager powertrain and responsive handling. The interior is well furnished, plush, and fairly roomy, but visibility is compromised. Also, on the downside, the ride is too stiff and cargo capacity is rather small. The useful surround-view camera system gives a bird's-eye view while parking. The QX's high price reflects an array of optional high-tech safety gear, including active cruise control and autonomous emergency braking. Some of those features are destined to catch on while others look more like works in progress.