He picked out the Rat Bastard root beer and I chose the Cock & Bull ginger beer, mostly because I just wanted to go up and down the aisles saying "I'm going to enjoy my cock & bull tonight!" Yes, very juvenile, I know.
So, the Rat Bastard root beer tastes just like root beer. Nothing spectacular about it. I betcha it would have tasted pretty good with a couple of scoops of ice-cream.
The Cock & Bull ginger beer was quite spicy. The Boy did not like it all because he doesn't handle the taste of ginger very well. His roommates and I once did a shot of ginger juice, straight from their juicer. A shot of ginger juice gives you a burn in the tummy for about half an hour. But I definitely felt a surge of energy shortly thereafter. The ginger beer has a similar effect, although no burning of the stomach for half an hour -more like just a thirty second burning. I think ginger beer would be great for digestion.
Now I wonder if there really is such a thing as Butter Beer outside the wizarding world.