I bought an 07 is 350 with 25,000 miles on it a couple of months ago. Love the car..I did change the Front brake pads because the factory pads left a lot of dust and where squeaking at parking lot speed (ANNOYING)....Put Ceramic pads on and the dust is minimal and no noise... I don't Track the car so i haven't noticed any loss of performance..
I am not aware of any problems associated with the vehicle..