This one is a bit strange for a 100% rye. For example, Alberta Premium Cask Strength is a 100% rye, and though there's a bit of caramel and mint mixed in, what's prominent with APCS is the spice, the rye, the cinnamon, little bit of nutmeg. The Whistlepig Piggyback Single Barrel has a little bit of spice, but what predominates here is are aromas of cherry and cola, reminiscent in some ways of Sazerac, which is decidedly not a 100% rye (the mashbill is undisclosed, but naturally if it were 100% rye, there wouldn't be any mashbill to not disclose). Rye spice takes over the nose as it sits in the glass with a little ethanol, but if you're used to Barrel Strength whiskies, it's not overwhelming (I've noticed that people who don't do high proof always find things I believe are perfectly palatable to be extremely hot). On the palate, it's not amazingly complex, but it's creamy and there's vanilla and caramel and spice with the cherry returning during the long finish. Overall, not necessarily a rebuy, but at $60, I can't regret it either. In the future I'd rather splurge the extra $10 to get a Knob Creek Single Barrel Rye or even pay the same price and get Wild Turkey Rare Breed Rye. But it also wasn't a bottle I was about to turn my nose up at either. I waited until the last pour to review it hoping it would reveal itself a bit more to me, but it was essentially a one-trick pony all the way through. Still, sometimes one trick pony's can be tasty enough to enjoy on their own. This was one. But that also means, it's a one-buy whisky and I have no problems with that. P. S. I realize upon further reflection that when I say cherry here, it sometimes tastes like cherry cola and at other times Robitussin cherry. Kind of goes back and forth. For what it's worth, the Robitussin might sound bad, but it's kicks in a certain nostalgia of my mom taking care of me when I was a child and had a cold.