I bought my cobalt used about nine months ago. So far, two of the tires have blown up while driving, the brakes are already bad, two speakers have blown out, the whole computer system is shot, all the tire moniters have gone bad, my flex pipe coming from the manifold is bad(costing $925.53 just for the replacement part), all the locks in the car have stopped working, one headlight has cracked and water is all inside of it, and last but not least, the exaust system has gone bad and needs to be replaced. Half of the time my car locks up when you try to cut it on, and the key gets stuck in the ignition. There was already a recall for the power steering, but that is currently not even a problem.
I like the MPG, and the car is fun to drive, When you can actually drive it....
Everything. This car has had WAY too many problems to be worht the 12,000 I paid for it. My suggestion, do not even consider a chevy cobalt.