Enjoy, and let us know how you found it (i.e. how you experienced it).
An ABV of 18.9%???
Wow.
That is up to sherry or port levels.
Personally, I find (or, have found) that beers that exceed 10-11% ABV have sometimes failed to integrate the alcohol fully into the beverage, and thus, sometimes can have that "burn" sensation when consumed that is unpleasantly reminiscent of some of the less subtle whiskies.
So far, knock on wood, over the past five years they have not disappointed at all! One of the best bourbon barrel aged stouts in my opinion around and I have had a lot of them. If this year's version is anything like the last five... it is a treat and yes it does pack a punch! The burn that you mention, and yes I know exactly what you are referring to, has been in many of them, but traditionally not this one. Which is why it has over 18K reviews and it comes in with 4.5 or higher rating out of 5 (Untpped as the source). It is a small batch, relatively speaking, and it comes out once a year.
The flavoring is intense and assaults the tastes buds with flavors abound with the kicker of no heat. Depending on when you drink it, fresh or aged, you will come across the bourbon. I mean if you didn't, and you were looking for this in a beer labeled as a bourbon barrel aged beer, you would be disappointed. But the bourbon is not over powering. They have found the way to run along the very thin line of being over the top bourbon versus just the right amount to compliment the stout beer.
This one is one of my favorites, if not my favorite BBA stout. If you have had any of the BBA from the likes of Founders, Firestone (Parabola), Oskar Blues, Epic, or Goose Island, this one to me, again my opinion, outshines all of the offerings from the above. However, if you can get your hands on some of the BBA's from Bottle Logic or Three Floyds, you will be in the same company or class of what I am referring to. Again, my opinion... oh and Bell's makes a pretty darn good BBA also!