I am a longtime bourbon drinker. I enjoy many different varieties, but my go-to nowadays is Knob Creek Single Barrel.
7 or 8 years ago, I had read that A.H. Hirsch Reserve was the finest bourbon in the world, and that the distillery had closed and so the supply was dwindling. Based on this, I bought my dad a bottle as a gift for about $80. He didn't actually open it for years - he wanted me to be there, then on various occasions when I visited him we never pulled it out. During that interval, I started seeing Hirsch-branded bourbon for sale again, and concluded that I must have either misunderstood or been misled about its rarity.
We pulled the bottle out a couple of years ago and tried it - I found it just stellar, with a really remarkably complex and rich flavor. I looked it up online and found that I had been right the first time - the distillery is long since closed and someone else us using the Hirsch name to sell an inferior bourbon.
The Hirsch I bought my dad now sells for $1,300/bottle if you can find it. A guy has actually written a book about it, The Best Bourbon You'll Never Taste -
http://www.amazon.com/Best-Bourbon-Y.../dp/0975870319
My dad is not as much a bourbon guy as I am, and has continued not to drink it unless I am there. It has certainly suffered a bit by exposure to the air after sitting for a few years after being uncorked for the first time, but I had some around Christmas and it was still very very nice.