One of the great things about the whisky surge over the past couple of decades has been the freedom of experimentation. With more volume moving off the shelf, distilleries need a way to stand out. Scotch, having stricter regulations than whisky in many other parts of the world, has to arguably work a little harder to be unique without alienating consumers. The Caol Ila 17 is an example of this deviation, by the simple act of not peat-drying the barley and bottling the whisky at cask strength.
Glenrothes Vintage 1998
The Glenrothes has a way of categorizing their scotch that is markedly different than most other distilleries. Rather than bearing a standard age statement or name in lieu of one, the Glenrothes labels their offerings by the year in which the barrels were first laid down. The bottle details tell you when the scotch was bottled, letting you do your own math to figure out the age. The Vintage 1998 is from their Core Vintage line, though there are Reserve, Special Release, and Classic lines too.