 It would be great if there was a way to really test a car more thoroughly then you can on a short test drive at the dealers.  I've had 2 previous Altima's; a 2004 and a 2012.  Both were good solid cars that I enjoyed, so I was expecting the same or better with this 2015.  Test drive seemed fine.  My major complaints are engine noise, and the CVT transmission.  Especially when cold the engine is more like a diesel than a gas engine.  VERY noisy even under mild acceleration.  Seems better after warming up a bit, but still probably the noiseist engine I've ever had.  The CVT seems to have artificial shift points built in.  The problem is when cruising at a steady speed (doesn't matter if slow or fast) the CVT feels like a manual transmission that needs to be downshifted a gear.  You can feel the slight but noticeable vibration in the steering wheel.  Also, the auto climate control is overly aggressive.  When in heat mode, the fan goes to full speed and stays there way too long.  You need to manually set the fan speed down a notch or two before you turn into toast.  When on a test drive, the sales person said the heater was "industrial".  She wasn't kidding!  OK, a few good points.  Good gas mileage, and a comfortable ride.  Performance is certainly adequate for a 4 cylinder (other than the raucous engine noise).  I was really debating between the Altima and an Accord.  Now wishing I would have gone for the Accord!