Auchentoshan doesn't get a lot of love, even when it's older. Some exceptions can be made when it's matured in sherry casks, but the bourbon casks usually retain too much of the polarizing distillery character.
This particular whisky was distilled in December 1997, filled into a virgin oak hogshead, then bottled in June 2016 at 48.4% without coloring or chill filtration.
I purchased this sample from Dramtime.nl
Old Particular Auchentoshan 18 Year 1997/2016 Cask #DL11203
Nose: creamy Auchentoshan malt with some maize character, sweet bourbon cask notes of caramel and vanilla, berries. After adding a few drops of water it is similar, but some grassy/floral character comes out.
Taste: sweet with berry notes up front, fades slowly into creamy malt and a touch of oak at the back. After dilution the sweetness becomes thicker and more syrupy, but the oak tannins spread out and become stronger to maintain balance.
Finish: balanced sweet malt, savory character, mild oak tannins, berries in the background
While there are parallels between this cask and the Scott's Selection I reviewed earlier, this is much more clearly a modern whisky. Much of the funkier medicinal notes and grassiness in the 1983 have disappeared leaving a much more straightforwardly pleasant product. I might even go so far as to say that if you actively dislike Auchentoshan, you'll probably still like this. There's absolutely nothing objectionable about it and I would have a bit of a tough time pegging it as a Lowland spirit rather than a generic Speysider. Some of this may be attributable to the virgin oak hogshead it was aged in, though I find it surprising that such an active cask left left a relatively light mark on the spirit.
At the time of writing this appears to still be available, though I find the price rather steep for what you're getting. While I'm glad to have sampled it, I don't find myself needing more. It's a pleasant drink and I wouldn't turn down more if offered, but I suspect there are more engaging choices out there.