i've ran a 147 gta for a year with no problems, my dad had a 156 gta for 3 years with no problems, my uncle has a diesel gt which he had for 3 years with no problems but then again my old boss had a 159 estate which he had for 3 months then it blew up!!!
so i guess its just luck of the draw, nice looking cars and still a bit different from your usual rep mobiles