Nose: Nutty and rich. Vanilla, marmalade, chocolate and pepper.
Palate: Thick, full, nutty, cocoa, stewed fruits, Demerara sugar, oak.
Finish: Long and thick.
Just picked up a bottle of this last night based on the information here and thought I'd post my impressions. I compared this rum to 3 others after picking it up; the Bacardi Reserva Limited, the Ron Zacapa 23 Solera, and the Ron Barcelo Imperial. I'm not gonna go into the nitty gritty between them all here, but the Appleton definitely stood as a unique flavor all its own. Nothing came close to that long lasting finish - you get all 21+ years. It's overall not my favorite to be really honest, but I'm glad I have it in my collection and don't regret the purchase. The bottle design, packaging and authenticity card are also nice touches if you're into all that.
24th October 2013
Forgot to add my rating, it's a full 5 stars.
29th March 2013
Quite possibly the best of the older aged rums, the Appleton 21 is like the 12 Year Old but more complex in texture and flavor and maybe a bit gentler due to its age. Really quite wonderful! I bought 3 bottles and nearly down to my last one. It is thick it is sweet with all the rum flavors you enjoy times three. It's eminently drinkable and you can't just have one dram you'll want a few. Get a bottle you will never regret it and you'll want more!