I'm not much of a coffee drinker but every time I'm in the area I make sure I hit these guys up. My drink is always made to perfection and tastes great, the people are always friendly and welcoming, the lines are always horrendous but they move quick.
As far as attitude rating, these guys are right up there with the friendly folks at chick fila, which is pretty hard to top because those guys over there are ALWAYS in a good mood lol.