I tried this yesterday:
Brand: Boylan Diet Root Beer.
Origin: Teterboro, NJ.
Purchase Place: Frattallones Ace Hardware, St. Paul, MN.
Review: Like many diet sodas, it's a little weak. It's also a little "chemically" and tastes a little off. But there is a nice little berry aftertaste that's unique. It's not that great, and it's even sub-par for a diet. Not the best.
Score: 3 out of 10.