The Infiniti FX is an SUV for people who like to drive. Both the V6-powered FX35 and the V8-powered FX45 give the enthusiast SUVs from Mercedes-Benz, BMW, and Porsche a run for the money, particularly your money, as the Infiniti models cost less than the German competition. Yet in terms of acceleration and handling, they give up nothing to the Europeans. The FX drives more like a big sport coupe than a truck-based SUV because it is more like a big sport coupe.
Both Infiniti models are exciting driver's cars, smooth, powerful, very stable. They can be driven much harder than traditional sport utilities, thanks to their big, powerful brakes and firm, fully independent suspensions. On the highway, they feel planted and much more confident than traditional SUVs. The V6 engine that powers the FX35 is the same engine used in the Nissan 350Z sports car. It's powerful, giving the FX35 responsive performance. While driving the FX35, we never found ourselves wishing for the more powerful FX45.
In fact, both FX models are based on the same rear-drive mechanical platform as the Nissan 350Z and Infiniti G35 coupe. They are not based on any Nissan truck, nor, as some folks seem to assume, on the similarly sized Nissan Murano SUV. (The Murano shares its front-wheel-drive architecture with the Nissan Maxima and Altima.)