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It's a legit issue, although it is hard to say exactly how widespread it is. Talking with people in my office, I've heard both, "Nope, no difference," and "I've lost at least a quarter of my battery life". It will be sorted out, and probably pretty shortly, as I imagine there are a lot of folks in Cuppertino that will be working late until it is. If I had a MacBook, MakBook Pro or MacBook Air I might wait to install Mountain Lion if I relied on battery for much of my laptop use.