These are a classic tomato based sauce starting with ketchup, Worcestershire sauce, sugar, seasonings, and smoke. It is the balance of flavors that is the genius of this sauce. Thick enough to stay put, thin enough to pour, even when cold.
All in all the flavor of these sauces are conservative. The balance of sweet (sugars), sour (vinegar and Worcestershire sauce), heat (cayenne mash) and smoke, simply make them perfect.