Interesting. Here is Sauceguide's take on this whiskey:
"Very light and supple, opens up nicely with butterscotch, caramel, gingerbread, caffe latte, cocoa powder, nutmeg, expresso, and a light oaky garnish".
Charlie Thomason, in describing the hallmarks of Willett's whiskeys, mentioned their fruity aroma (ripe apple, he said). This 15 year old does not seem to have this taste or nose. However Sauceguide's description of Johnny Drum 12-year-old states, "Mellow vanilla, creme caramel, baked apple...". If these whiskeys are Willet's, maybe the 12 year old still has one of the signatures whereas the wood in the 15 year old might obscure it.