I purchased the car in November, 2011. No significant complaints so far. The acceleration is very good and the car handles well. The interior is nice and it is comfortable (except for the rear seats, which are cramped). Gas mileage isn't great, but I knew that when I bought the car. Compared to a BMW 3 series (which is what I had and which I was considering buying again), the value of this car can't be compared. It would've cost probably $15,000 more for a comparably equipped 335 BMW, and the Infiniti has a bigger engine (330 hp). The manual transmission is smooth and has a very short movement, which is nice. The Infiniti also uses standard motor oil, unlike the BMW.
Love the car. Acceleration, steering, comfort, ride and so much more. I use it as a commuter, but it is also my weekend trips fun car. The truck is small, but you can lay down the back seat. The back seat has limited legroom for passengers on long rides, but OK for short trips. I just test drove a 2016 Q50, it is a great car, but I will drive this one for several more years, too much fun.
Although gas mileage could be better, but that's not why you buy this car. It is the luxury sports car that I always wanted. My 2012 G37 is wonderful, it makes a statement not only an entrance. From that throaty sound from the 330 hp, nice leather interior, and the wide stance it has on the road, traveling for two at it's best.