Excellent, quiet ride with lots of technology (backup camera, sport setting, etc.). You can buy these used for very cheap now, and the quality is excellent. The only issue I've had is oil burnoff (no leaks, etc. - oil consumption is high for some reason). But I haven't had any breakdowns and the car has been bullet-proof. I get 21 MPG (70% highway), which isn't bad for a car this big with so much power.
Quiet ride, comfortable and plenty of power. Rides just as good as new luxury cars costing much more.
Oil consumption - change oil every 3k miles and add a quart at 1,500 miles to be safe.
Car has now been flat-bedded for repairs 3 times, am on 4th battery ("Infiniti" batteries are made in Mexico and last me 1-2 years.), entire left side of exhaust--engine to tailpipe--had to be replaced, one entire HID assembly replaced at less than one year, all 4 pressure gauges needed replacement, body shop did poor work and failed to cover all new paint with clear-coat, console cup holder lid requires solid thump to open, glovebox- -with 6-disc changer--has very little room, paint scratches if you look at it cross-eyed, crazing developing in f/r bumper fasciae, transmission still hesitates too much on downshifts, cruise "On" light "assembly" burned out--over $300 (Skipped it.).
Very comfortable interior still is, stereo is great--though integrated and cannot be modified, storage in rear center armrest is nice--but it always pops open, and that's it. Oh, it's only broken once this week--another dead battery. (Optima Red Top, here I come.)
Build it with the quality that a plain old Nissan Maxima or Altima would have. Well, a moot point, since the Q is no longer with us. Hmmm...wonder why.
I have owned this car for more than 3 years and the biggest problem I've had is that it is too big and too long for me to move in tight parking lots. Otherwise the car is very reliable and comfortable, with ample power.
The absolute best high end automobile I have ever owned (big MB's, Beamers, Cad). A dream to drive. Like all dealers - they milk the system excessively - but the quality of the car makes it worth the BS.