Let me qualify my review by stating that I have not been to Butter & Me. I have had their yummy mini cupcakes at a Yelp event.
I tried the red velvet mini cupcake. It was really good. Moist and flavorful with a rich creamy frosting. Yum. I chased it with few sips of Cruz tequila. Hey, it was in my other hand.
I also tried a chocolate mini cupcake. Yummy. Again, moist and delicious. I don't know how they keep the mini ones from drying out. When I make mini muffins at home they dry out easily (that is if any survive the first half hour...the survival rate for any kind of pastry in my vicinity is exceedingly low).
I also garnered a few extra cupcakes to take back to my wife and a friend and score points. Mini cupcakes=brownie points.