Just recently snagged a x3 xdrive 28i (2012) with a inline 6 cylinder engine.
The transmission and the engine were sublime.
But the seats .... for a car at that price range there should be more support and cushioning. The seats were just hard and lacked support. We noticed how bad it was after we were in it for 5 hours during a road trip.
The car could sustain high speeds and remain composed and comfortable in them.
There was no start stop feature or different modes for comfort and sport. Perhaps because it was a '12.
Great handling car though and well balanced steering for a lil suv.
Had to return it though as it had expired plates. Got a G37x instead. Which too is great.
The weird thing is the BMW had 27000 miles on it and the G37 had 20000 yet the BMW controls like the signal indicator stalk, wiper stalk etc were solid. But the infiniti seems to be just very loose. Maybe its just this car.