What's good: The Cupcakes and the choice to design your own cupcakes. This is 'Merica, and we're all about freedom, and cupcakes are not exempt from that. This is not one of those communist cupcake places where they tell you what to like and how to eat it. Here you can try your best to make crappy cupcakes and no one is going to stop you.
What's bad: Well, the customer service has never been spectacular, but never been particularly bad. So that's not technically bad, but it's relatively bad. Which is bad.
Potential Disaster: Designing cupcakes from the filling up can be a lot of responsibility. Famished stoners in the throes of cravings could become overwhelmed quickly and hold up the line. (Not that I'm recommending such things.) The nature of the place makes for a one person at a time method, and while it is the crux of the charm in the place, it is not a speedy process.
Bottom Line: These are spectacular cupcakes. Come prepared with cupcake motifs you might enjoy.