First of all if you are thinking of buying a Nissan, please keep in mind that you will need a lot of patience with the service department.
The first problem I experienced with the car is the brakes. The brakes were making very loud noises right after I bought the car. It took me 3 visits to the dealer until they recognized the problem and fixed it. It was just a problem with the brake pads. Apparently the pads were new, but they were an after-market brand that the previous owner had put in the car, which was not very compatible with my car.
The second problem was one of the 12V electricity jacks. It stopped delivering power, but the problem was just a blown fuse. Those kinds of small maintenance problems are inevitable in a car.
The third and still unsolved problem is a small constant tickling noise and vibration that comes from the front (around the left wheel area specially when shifting,) I am not sure if it can be the axel shaft or something else. All I know from previous experiences that it is not the LSD (the dealer consist on telling me that I am probably hearing the LSD sound,) but if the previous owner used to launch the car hard in an everyday basis I think it might be the axle shaft or the engine mounts. However, I will reschedule an appointment with the service department again, and if I found out what was the problem I will post it on this website.