I agree with the comments above about age. I feel that 16 -24 years is generally ideal, although some, lowland scotches for instance, are generally regarded as best drunk at younger ages. But once in a while an over-30 bottle has something magical that I have never experienced from a younger bottle. I have had two over-30's which were not excellent - you pays your money and you takes your chances.
For some reason young scotches are popular in Italy, I can't imagine why.
I am entirely persuaded that avoiding chill filtering is important to tasting the full flavor of a whisky.
45 year old Springbank! I volunteer to help! Rare, and likely to be very different and interesting, but not necessarily "better" than other Springbanks. Scotch really does not improve past the early 30's, as far as I know. But I intend to continue the research...
I agree with whoever above observed that the oak McAllans are not comparable to their traditional format, but the sherry in McAllan is sometimes just too much. You need to keep a few bottles of different types handy!
I will put in votes for the great Glenmorangie and Balvenie bottles, first rank distilleries. They are very rarely available in independent bottlings.