And yet, and yet... Accents are so very much in the ear of the beholder. I was born in the Bronx, raised in Long Island, went to school in Boston; I pick up the accent of whatever group I'm among for an hour or two (or I used to anyway), and my accent -- well, it depends. I've been told by New Yorkers that I can't be from there, I don't have the right accent -- but the further away from the US East Coast a listener originates, the more obvious my NY accent is...

In any case - the Eh? the thread was initiated over seems to me to be such a clear regionalism - but with so many different regions using it - that to assign it a "correct" pronunciation will of necessity be arbitrary, and disputable.