Nothing at all.
I am really enjoying my COBALT LT with SPORTS PACKAGE. I am liking it much more than I originally thought. Very comfortable and good on gas.
Update, I have now had this vehicle for almost two years and not one issue since we bought it. It was purchased as the family's second car and it has quickly become the most popular. It is fun to drive and responds very well. My only complaint is that I don't think it is as sturdy a body as the imports. I feel my cobalt rattles alittle too much on harsh roads, but otherwise I am very pleased with it!