It's got a lot of head. When I set it down, it nearly foamed over. And then it stayed like this for a few minutes:
Brand: Spring Grove Soda Pop Root Beer.
Origin: Spring Grove, Minnesota.
Purchase Place: www.springgrovesoda.com.
Sweetener: Pure Cane Sugar.
Review: It's heady, earthy, smooth, and has a little bite. There's a nice subtle vanilla flavor too. The only down-side for me is that there's just a HINT too much anise (I'm not an anise fan, which is too bad because it's used a lot in root beer). I can't outright say it's my favorite of all time, but it's up near the top.
Score: 8.5 out of 10.
(Side note: Spring Grove Soda is great. Check out their website and order an assorted case!)