Based on 8 months with a 2006 GT, the airbag warning light will come on at some point and it will be the sensor/wiring beneath the passenger seat. Easy fix at the garage.
Other than that, nothing has gone wrong - you'll just have to get used to comedy mirrors that are there for decoration rather than functional reasons; a long swooping bonnet that you'll have no idea where it ends; a low nose that you can scrape on high kerbs (d'oh!); and a bootlid that will dump water down your arm/into the boot when you open it.
On the plus side, you'll get one of the best-looking cars you can buy for sensible money; a practical boot; more space for rear passengers than you might think; and an effortless cross-country mile-muncher. You'll also be the envy of all your friends and chicks/chaps (delete as applicable to your preferences) will be all over you.