I tried Magnolia's on the upper west side. I'd of course heard a lot about it but hadn't actually ried it, even though I've tried a lot of other cupcakeries. Shockingly bad. Wow. The frosting tasted authentically chalky -- way too much confectioners' sugar is all I can surmise. Yudge.
I recently tried this new bakery in village on Carmine. First, its cupcakes look beautiful, with carefully styled frosting and streaks of colored food gel in it. Second, they are quite tasty. I had the crimson, which had creamcheese frosting, a raspberry theme, and raspberries baked into the middle. They serve it to you in a cup, and give you a flat wooden spoon to eat it with. Excellent.