Thick and extraordinarily burnt/bitter for a stout. The barkeep said he thought it was mellow but it was basically the polar opposite of that. The photo doesn't really do the color of the head justice - it was a deep chocolate brown.
I find that I like guava best when it's got kind of a clear hard candy flavor profile and this beer has that. Starts with fruit and immediate tartness, moves to a strangely light-tasting phase and finishes tart again with sweet cereal emerging at the end. Clean and tasty.