This is one of my favorite places in the city. The baristas are awesome and the coffee is great. Get to know the folks serving you -- they're all interesting and talented people!
It's a very casual environment, so if you like the process of going through the line, giving your name and then waiting for your order to be called, you should probably go across market square.
There is often a line, so please be patient. It's worth the wait.
Pro tip: if you get a cup of coffee, you receive $1 off a pound of the brew of the day. And, don't forget to get a punch card ... You get a pound free after 10!