It's a different world to the 10 y/o in my humble opinion, if you could compare the 10 y/o to a top-end alloy hard tail, and the 18 y/o to a custom-built steel hardtail with a carbon seat/chain stay – a more refined ride with that harshness removed, but yet more refined, controlled and ultimately much more enjoyable.
The bottle was a gift and spending £75~ on one bottle of drink is quite a bit more than i'd spend for a good bottle to drink, not much more and they'd be investments! Which brings me nicely onto the Islay festival. If you can afford to purchase some of the special, festival-only bottles then I would heartily suggest it! If you could buy two of them, one to drink and one to save that would be better 😉 I had some friends of laphroaig 2007 bottle which doubled in price the next day! (and has remained fairly consistently up there) (http://cgi.ebay.co.uk/Laphroaig-Vintage-1989-FoL-2007-Feis-Ile-/270577262296?cmd=ViewItem&pt=UK_Collectables_Bottle_Pots_ET&hash=item3effa95ed8) (that's not mine btw!)
I wish I could afford to re-visit Islay this year! Take some photo's if you go!
jt