I have had my Cobalt for 5 years now, and I have put about 70,000 miles on it. Around 45,000, the brakes began failing. Around 60,000, the transmission began failing. Just recently, it has begun violently shaking whenever I brake or accelerate. The car has served me well, and I haven't had to replace anything yet. Once the transmission fails, though, the car is totalled. I have manual locks and windows, so I have not had any problems with the doors locking me in or out. This is a good car for first-time drivers, but if you want a long-lasting car, I would avoid the Cobalt.