The wife and I ended up calling it a vanilla pout because it had more stout characteristics than porter. A friend's wife said that it was by far the best beer I've made and she said it rivals any similar commercial brew. The head retention was not as good as what I would have liked. All in all, the vanilla flavor is subtle and it tastes like a light-bodied stout and drinks as smooth as silk.
Real cool, I'm making Ed's Robust Porter, and throwing 2 chopped vanilla beans soaked in vodka or bourbon into the secondary. Seeing that the vanilla flavor was subtle, I might just throw in 3 vanilla beans. Neat recipe!