 Well its been almost 5 yrs and only 34k mi.  For the most part the car has been ok, but there is a troubling problem with rust.  If you live in a salt state like Ohio, do not buy this car.  The 2004 and earlier optima has a bad under body rust problem which includes the sub frame.  Things like metal brake disc shields have already rusted off and most hardware like hose clamps and other hardware in the rear are about gone.  None of this is covered under their warranty.  The drive train may last 10 years, but much of the underneath wont be there.