Naturally Jim Murray praises it to the skies and gives it 95...but I was initially disappointed and I too questioned whether it was worth 2 10 year olds... or 2 QCs for that matter.
It is more subtle and has a bit more going on than than the ten,and is more ballsy than the 17, no question but...it took me a while to appreciate. not one of those "instant" whiskies. I bought one on Ardbeg loyalty alone. Not sure if I would have had I tried it first, whereas, having been given a taste of "Still young" at Oddbins, I immediately wanted a bottle, and eventually swapped a bottle of (truly underwhelming) Serendipity for it...and was glad I did.
But then Jim gives Serendipity 96, and in my opinion the Beast is a lot better than that!
... it has certainly improved, as some drams seem to, as the bottle empties and interacts with the air in the bottle. But that's an expensive way to enjoy a whisky! I guess your best bet would be to decant half a Beast into an empty bottle of 10 YO so that you have 2 half bottles, and let it sit a coupla weeks before you taste it...
Seems the jury is still out on this one.