The drivetrain is fairly robust, much the same as 34GTR running gear. The auto requires at least a shiftkit to perform anywhere near as well as it should, and the turbo is a grenade due to the stock 14psi on a ceramic turbine.
The AFM's are known to fail, but mine is still the 12 year old original. Crank/cam sensors can occasionally fail, especially if the recall for them wasn't carried out.
Other than that the car is very reliable, even at triple the stock power.