Surprised me from the first taste. I knew this was a highly rated barrel release (B520) of a highly rated bourbon (I have had/rated the earlier 2019 EC barrel proof A119 release), but... this one really sings an octive higher. Drinking out of a camp cup at City of Rocks Natl Reserve, ID, social distancing, no fire (cuz the whole West has been on fire), in the off-season cool of Sept. Maybe it was the ambiance but...WOW.  Nose is fruit, vanilla, and grain. Whoosh, in the mouth: big woody oak, char smoke, and burned brown sugar caramel candy popcorn, with grassy rye coming through later. Then on to an astringent mint and grassy rye, and then finishes a clean oat cereal. Great mouthfeel, silky, and good heat that doesn't overpower but lets you know it's there. Opens with a little ice to catch those taste transitions.  Have now tested this bourbon away from the campground where the sunset and quiet surely affected my judgment, but... it didn't. This is a big smoky sweet bourbon with enough rye coming through to give it character. Worth the search and price.