I have not tasted this expression, but as I did tasted a Caol Ila rum finish before I thought to share you my idea's on it and hope its usefull to you.
I was a bit reluctant to get this finish at first. At times you think they are going too far with these, but then again, they have been using bourbon and shery casks for a long time as well, so why not.
I was very pleasantly surpised with this finish, it added a warm mandarin sensation over the otherwise pretty strong caol ila.
Here's the note I made of it:
Distillery: Chieftain Score: 7.9 ABV: 43
Expression: Caol Ila Rum cask finnish, 12 yr, distilled juli 1990 Date: 8 jan 03
Price: 53 EURO Color: -
Nose: Warm, mandarins and honey.
Palate: Soft full, and the changes to a bit dryness.
Finish: Soft, then changes to bitterness.
Comments: If only the finish was as good as the nose and palate. It would have been a much better malt then.