"As far as performance goes, the engine's pretty modest. Matting the gas pedal off a stoplight doesn't do much besides make noise. Trying to find power on an aggressive corner exit isn't all that rewarding either. That said, the QX50 does surge to passing speed with plenty of competence as long as it has some momentum.
"While Infiniti is not the first company to experiment with the concept of variable compression, it is the only automaker utilizing such technology in a mass-market production car right now. It seemed smooth to me, but we'll have to wait and see a few thousand hard miles on these engines before we'll know if the tech pays off in the long run or becomes an obscure piece of automotive trivia."
-- Andrew P. Collins, Jalopnik