It's perfectly fine to limp in with AA from EP on occasion, but I wouldn't make a habit of it. I believe Harrington recomments doing it about 20% of the time.... I find myself doing it about 5% of the time (if that).
I HATE losing with AA though, so I prefer to decrease the chance of that happening by playing it strong. I'd much rather win a small pot with AA than lose a big one with it...
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