I was thinking of getting a bottle of this, as it's on sale in my neck of the woods. I've only had the 12, which I like, and I was wondering if people thought the 21 was worth the extra money (about $30).
It's worth the money, this one was in my eyes richer and fuller of taste and perfectly balanced with the aroma's in it. Some chocolate and heavy 'old' citrus I had with a creamy taste, but very nice and soft in the finish smooth I would say ( depending on the state of your tastebuds ). A nice dram, I kinda liked it.
since you like the 12 year old you will also enjoy the 21. my gf surprised me with a bottle for valentine's day. I doubt I would have bought it myself since my favorite 21 year old is balvenie portwood but I'm glad I have the opportunity to enjoy it. like the 12 it is rich and creamy. I agree with erik on the chocolate taste. the finish in my opinion is somewhat different than the 12. I'm not experienced enough to know exactly what the difference is, at first I didn't care for the finish but after a few drams it seems more to my liking. I think it is worth the extra 30. I always keep a bottle of the 12 on hand as I enjoy the taste and I believe for the price/quality is one of the best deals on the market.