I bought the 10 yo stuff on a lark (well, the US$9.00 price had a LOT to do with it.) It turns out the stuff is pretty damned good. There's nice honey and caramel qualities that rival some of the more-expensive sherry-casked names but it does finishes fairly harsh.
With that in mind, I bought the more-expensive (~US$42.00) 18 yo SMS. Aside from having a kick like a mule there's nothing in this bottle. No bouquet. No finish. No nothing. It's an expensive drunk.
(sigh) Live and learn.