I tasted this with a full compliment of Mortlachs ( OBs Rare Old, 12, 14, 15 GoT, 16, 18, 20, and the 2019 G&M 25), and if there is something to be said for the whole OB line, the 43,4% bottling strength is too low because it kills the finishes.
Feels a bit less smoky and sweet than the 12yo, but fattier. Gentle fruit and wallet leather notes, and some more chocolate than in the 12yo.
Sticky, resinous sherry at first, and then some mild peatiness. Feels once again too flat. Diageo, please up the % in these. This "legacy" 43,4% gimmick is not helping. Butter, nectarines, and some bitterness. These really aren't the best sherry casks, are they?
Oaky and resinous, and somewhat bitter at first. Too acrid and grassy for me. Curiously time helps quite a lot with this, making it sweeter and more pleasant, and bumping the score from 81 to 83.