I've lived in the NY area for 12 years now and I can't believe I have never been to Shake Shack, despite all the positive reviews. Anyway the wife and I and my adult daughter had lunch in the UWS location a few weekends ago. We got there pretty early (11:30 ish), which was a good thing, because by the time we left the lines were very long.
Now for the food. We each had a Shackburger (single) and shared an order of fries. Wow, really great. Not sure if it was the best burger I have ever had (would have to sit down with a Burger Joint burger, a Five Guys and a Boom Burger for a taste test), but it was absolutely one of the best. The bun was amazing; so fresh. And the burger was wonderful; very moist and flavorful. I would say the fries (which were salted after being cooked) were some of the best I have ever had. So lunch for 3 with a large soda was roughly $20. Good cheap eats.
I love the fact that you get a beeper when you place your order and can just wander around until it vibrates. The only slight negative is the lack of seating (we did manage to snag a table). But in nice weather I would just take the food out and sit on a bench around the museum.
Really enjoyed this place and will definitely return.