I have one for my 360 because of the red ring of death problems. (I'm on my 3rd one) I would almost say that it is required for the system (360) to last. I work at eb games and when someone buys one I all ways recommend it to them. When they don't get one they eventually get the red ring about 95% of the time depending on how much they play. The ps3 on the other hand has had very low defective rates from heating issues so i would say its not needed.
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