I do remember the outside of these Burger Chefs in my home State of New Jersey. But I never went inside one. I hated hamburgers (still not one of my favorites), and didn't try any fast food places until I entered the Army at age 20.
In New Jersey at that time we either went to a proper restaurant, or a classic Jersey diner or roadside stand if you were traveling, even a drive-in. Or perhaps a Howard Johnson's, which was sort of like a fancier diner, still with a lunch counter but adding nice seating, too.
I still favor locally owned places over big fast-food chains, whether at home or when traveling. They don't have to be fancy or gourmet, but some individual character helps, so I can tell one from the other. And people there I can talk with and get to know, especially if I'll be returning.
I hate going into places where I'm always a stranger. My late Father was exactly the same way.