I recall that Rhode Islanders have a weird obsession with coffee-flavored milk. But I don't remember whether there is actually coffee soda in the US.
Coffee soda does seem to have some coffee flavoring in it. But it also tastes a bit like root beer and a bit like chocolate. It's slightly bitter and very sugary at the same time, which is a little weird.
With just 10.5 mg (half as much as a can of Coke), this stuff doesn't have enough caffeine to make it worthwhile. Interestingly, the back of the can seems to suggest a daily caffeine limit of 150 mg. Depending on your brewing style, that could be as little as one cup of coffee! Clearly these people have never lived in a college dorm or worked in a newsroom.