Bruichladdich fifteen

Hello to all,

luckily I was able to buy a 0,2 l bottle of the Bruichladdich fifteen first size.

http://www.bruichladdich.com/wwwprod.../15/15sell.pdf

Love it, very fruity, a little Islay - smoke and peat - all in all great !

I´m currently thinking of buying a 0,7 l bottle, but it is not cheap.

The Bruichladdich 12 yo Second costs half, but haven´t tried it so far.
How big is the difference between this two ? Is the fifteen worth to pay the double price ?

Thanks a lot for all hints and suggestions.

Simon