We stopped here a few times during our honeymoon (and at the Newbury St. location) and found that the coffee here was delicious as well as the lattes and sweet drinks. We would highly recommend the carmel fredo - its a very sweet caramel freezer blended coffee drink that they serve which is excellent on warm days out on the Cape.
Provincetown has its own unique charm and flair as a city and wired puppy fits right in to this quirky little town. It is centrally located on a main strip which provides for much in the way of people watching even if seating may be a bit limited. There seemed to be a never ending stream of customers but the line never grew too long.
Most importantly for the coffee lovers, the espressos, americanos, and stiffer/more serious coffee drinks were stout with quality flavor. Overall, an excellent coffee shop with some majorly delicious offerings. If you are in Provincetown (or on Newbury Street), you would be remiss not to stop by!