I would have to disagree that the was that high, a good example of this was me. I purchased a 360 unit and within 3 months the the lovely red rings killed it, i can easily tell you that it was because of heating problems. Same story with my friend who bought the system, installed it, put in the gears of war cd then went to eat dinner came back and red ring. So my point being that its almost impossible to tell since its just so random, 50 percent sounds about right to me.