 I had 2007 Infiniti M35 for 7 years and over 185,000 miles.  The Bluetooth was useless, it went through brakes pretty fast and gas mileage wasn't great, but other than that it was a great car.  So, when it was time to get a new car, I bought the first model year of the Q50 hybrid.  Over the life of the car the drive-by-wire steering failed, the audio system never worked properly, the Bluetooth was useless, the transition from electric to gas was very rough, the gas engine would suddenly rev up while sitting at a stop light shaking the car, the car would actually speed up if you didn't push down on the brake hard enough, the car would shudder when accelerating out of a turn with neither gas nor electric engine knowing what to do and the mud flaps kept falling off.  I participated in two Nissan factory studies on engine performance and the exhaust system, which really made me feel like I was driving the beta version of this car.  After being told repeatedly "that's just the way the car was designed", I learned to live with all its deficiencies.  I was planning on selling the car before 100,000 miles, but since it hadn't really held its value very well, I decided to just drive it into the ground.  I didn't have to wait very long.  At 101,806 miles, 1,806 miles beyond the warranty, the hybrid battery overheated and needed to be replaced.  (I was one of 5 towed into the dealership that day with the same problem.)  That "part" cost $12,000!  With labor to install it, the total price was going to be $14,000.  The appraisal I'd gotten from CarMax just 200 miles earlier was $11,000.  Obviously it made no sense to repair it.  The dealership, Infiniti of Montclair, had no interest in helping me and suggested I get an attorney to escalate the matter.  Despite having owned and faithfully serviced Infiniti cars for the previous 11 1/2 years, Infiniti consumer affairs refused to buy the car back for a fair trade-in value or to even help out on the cost of the new battery.  I wound up having to sell this $50,000 luxury automobile with 101,806 miles on it for salvage value.  DO NOT BUY THIS OR ANY OTHER INFINITI PRODUCT.