At a subsequent trip to Treehaus, I picked up a Nunu 70% bar, which I liked better than the chocolate covered graham cracker. I ate it with some other stuff, and it was nice and chocolatey, with a mild coffee flavor. Exactly what I wanted.
With a clean pallet it was not quite as great -- it had a slightly acidic taste. But I still enjoyed it.
Bottom Line: A nice, local 70% bar.