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I just poured and drank a quart of Arrogant Bastard Ale in my 30. It stayed ice cold from start to finish. I consider myself a connoisseur of cocktail cups. (alliteration?)
This, my friends, is the best cup I've ever owned. It doesn't have the lifetime warranty of the Tervis but performs so much better. Everyone I know will be getting one of these for xmass.