Desserts are hit or miss, food is normal diner fare that's affordable, but the atmosphere is cool! I'd bring a friend to impress with the throwback concept as you don't see these Old Fashioned soda shops anymore.
I'd recommend the pumpkin dessert that is not on the regular menu and shows up in the seasonal homemade desserts menu. The brownie in the sundae is more cake-y than fudge-y if you prefer that. Of course, you can't mess up their shakes and floats, which is why I would come back if I wanted to show around a visitor.