Weyerbacher is a fantastic brewery out of Pennsylvania that really deserves more attention, especially since they've been crafting exceptional beers for 16 years now. They do some fine year-round beers, the Merry Monks being my favorite, and also do a large number of small-batch, limited release and seasonal beers.
Among them is Heresy, which is their Old Heathen imperial stout aged in Kentucky bourbon barrels.
And it's a pretty nice one. Just look at that tasty pour! The rich, foamy head so thick you can flat a cap on it!
Thing is, for being a pricier version of their standard issue imperial stout, the oak aging didn't do much for this brew. It has a slightly woody nose with a touch of bourbon, but you really have to be looking for it. Most of this is just nice imperial stout with strong chocolate taste from the roasted malt. Not that there is anything wrong with that! It's a good beer with a great roasty flavor, just didn't seem to benefit much from the barrel aging (which is all the rage these days among American craft brewers).
Comes in at 8% alcohol, but it's a very smooth 8%. You'd never known it was a more potent than usual brew. I've seen reviews that said the alcohol taste was kind of hot, but not in my experience. Maybe it's because I've had it for a while and let the alcohol mellow. (The bottle was about seven months old, stored at room temperature.)
All in all I'd say the Heresy is worth a look, but if you balk at the price consider a single bottle rather than the four-pack.