Nose: First whiff, a ton of alcohol, a little spice and wood. Second whiff, ton of spice and wood, still a lot of alcohol.
Palate: A potent blast of spice and oak. While there's no question it's cask-strength, it is remarkably balanced and drinkable without adding water (my recommendation). Water does bring out some more flavors buried beneath its kick (more clove, cinnamon, and a little mint), but weakens the experience overall -- maybe save the water for the last bit.
Finish: The burn lasts from start to finish, and the finish is long. As the heat -- eventually -- dies down, some more typical whiskey flavors come through (honey, brown sugar).
Overall: 9.5 out of 10 -- do what you legally can to get yourself a bottle. Even at $75-$100 it's well worth it.