I've never heard of Duly's, but when I worked in downtown Detroit, I frequently ate at either American Coney Island or Lafayette Coney Island because they were right down the street from the newspaper where I worked. It was always an adventure. The countermen screaming the orders to the cooks, crowded little tables, questionable cleanliness. Burger King it wasn't.....you either got the dog THEIR way or you didn't get it at all. Don't like onions? Just scrape them off when you get it.....don't dare ask for it without onions. You want ketchup? Fuggedaboudit. You get mustard. Don't like mustard? Tough. You get mustard.
So why did we eat there? If you've ever had a genuine Detroit coney island, you don't need to ask. Food of the gods.