Nothing at all, so far (we have only owned it since May 1st).
This car was bought as a replacement for a 6-year old Montego TD estate. It is much more comfortable (particularly for my Wife to drive, due to adjustable seat height and adjustable steering column) and quieter, but is not quite as fuel-efficient (we get about 40-45mpg where we used to get 45-50 from the montego).
So far, we have been very pleased with the car, and would definitely buy another.
Good news for me then!
Surely any vehicle would surpass a montego!!?