Primo has crappy burgers. They should call it Sub-Primo. There, I said it.
In just about ever city or town in America you can get a quality burger. In Seattle you have quite a few options, so it baffles me that a place like this can survive. The burgers have almost no flavor, the fries are boring and they make the shakes by putting soft serve in a blender. Do us all a favor and don't go here, that way something new can open up in the space.