Have been to GB a few times. The menu is simple. Basically the same noodle soup base with meat. The selection is with or without chillies, size of soup and the thickness of the noodles. It is very popular and always line up at lunch (never been to dinner). Soup base is flavorful. Noodles are handmade and quite tasty. I like it enough that I have been back a few times but I usually avoid peak times and go a but earlier or later.
They do have other small items as sides as well