Is Shake Shack Fast Food?

Hello Everyone, 
          In class on Tuesday we had an in depth conversation on what we consider to be fast food, why we love fast food, and where we can usually find fast food.  Shake Shack is a hamburger joint that quickly swept the borough of Manhattan and now has opened it's first location in Queens, located in Citifield.  Making it a total of four locations in New York, with more to come.  But is Shake Shack fast food?  I had the opportunity to eat Shake Shack last night while I watched a Met game at Citifield.  Although the burgers are pre-made, you will never stand in a line for less then twenty minutes.  I actually know people who work across the street and spent there whole half hour lunch break waiting for one of these burgers.  But it is definately worth the wait.  The burgers at Shake Shack are regular hamburgers, with lettuce, tomato, and you have the choice of adding cheese or not.  Also on the menu they have cheese fries, regular fries, hot dogs, and many options of milk shakes, but aside from that the menu is very limited and consumers usually walk out with just a hamburger and a shake.
          I would'nt consider Shake Shack fast food because there burgers taste fresher.  The burgers arent as big as one you might get from a restaurant for relatively the same price, but it also is not a small freezer burnt processed hamburger that is heated up for your enjoyment.  The burgers at Shake Shack are juicy patties, made up of chop meat.  There isn't much mystery to there meat, because it tastes like something you can very well make for yourself in your own kitchen.   Will it one day be all over, and have drive through's on highways and rest stops?  Who's to say?  I am just happy that it started here in New York City and I had the opportunity to enjoy it before if falls victim to the fast food monopoly.