I just hit the 1 year mark a few weeks ago (8700 miles on odo) Basically no problems other than oil needed every 4k miles. No tire problems either. My GT is rattle free (am I just lucky?). I just wish the nav was more accurate. I also think the car is not nimble enough, although driving in "Sport" mode makes it track better, but you can't toss it around.
2011 550iX GT, 2011 MB C300 sport, 2003 Porsche C2 Cab (turbo conversion)