I have a second office. On some days when I am meeting friends in Madison, or particularly nice Fridays, I leave the office early with all of the mail, magazines, reports, etc. that I need to read or things I need to look over and think through. I go to a coffee house on State Street in Madison, sit at a table in the window, and work. The atmosphere is conducive to great thinking and there are no interruptions.
There is a Starbucks across the street that I think I was in once or twice in the 2-3 years it has been there. It comes down to the coffee (well cappucino or lattes, usually). Espresso Royale is better. I've been to every coffee house on State Street, and think I could rank them in order. Starbucks is about the middle of the pack. In terms of atmosphere, maybe better than most, only because it is close to the most active part of the street and has big windows looking onto it. But it still has a canned feel to it.