Ok so getting the obvious out of the way...the cakes are amazing. Since you eat with your eyes first, presentation matters. Tammy Coe has that down to an art. Then there's the flavors which can't be praised enough. Their bakery items are excellent too, and even their breakfast items are wonderful.
Coffee and tea earn high marks as well. All around great. Incredibly though that isn't what makes this tony shop click.
The people.
From the moment you walk in the door you are met by people that seem to love working there and they share that joy with you. Always friendly faces, smiles, and impeccable service. While you wait for a pour-over coffee they make sure you have a few minutes and are prompt letting you know when it's ready. In 2 years of going here for morning meetings or First Friday sweets I have yet to have a bad experience.
Bottom line, if you want something sweet and service is important this place is worth the trip.