Aside from homemade, they are the best cookies I've ever had. Their ingredients, especially the chocolate they use is top notch. We love to get a couple cookies and snack on them throughout the week. They are big, but think of each cookie as 4 cookies because a quarter of it is really all you need. Their cake slices are pretty amazing, as well.
The inside of the shop is pretty cool too, but if I weren't getting the cookies, I wouldn't wait in line just to go in.
We usually go check out the line as soon as we get to DS. If it's really long, there'll be a virtual queue so we put our names in and shop and eat til we are called.