Some poeple can tell someone has autoquicken afther a duel. It has a effect on the casting, you have to time your casts different against a mage whit autoquicken, spells get fired earlyer. But it doesn't gives a big advantage like epic doge does. A good caster won't have much problems dueling a mage whit quicken anyway.
It's not that bad in my eyes, my mage is way worse whit it's hide in a mage duel, just ask talon or max
But if you want to do a clean mageduel, whitout complains, just don't take it, it's a waste of 4 feats on top of it.
Reminds me to script a haste check for arivs.
-Mel