I remember being a kid, I'd always ask for "Mug" root beer because of those commercials. They would go on and on about the foam being so thick, I was sold!
Then I found out IBC root beer came in glass bottles and I wanted those more, because glass.
Eventually Josta became my soda of choice, weird that I say soda now but I suppose 8 years in Florida will do that to you. I used to call it "Pop" being from Ohio.
I guess what I'm trying to say is I haven't had root beer in a long time but I used to like it as a kid. Problem was I would get stomach aches, IDK if it was the sugar or caffeine or both but man they sucked. I haven't had a stomach ache like that for nearly 15 years, but I'll say this NYFRB gave me the exact same stomach ache when I tried it.
Now if somebody were to make a Not your father's Josta I'd be all over that ****.