The colour is pale gold and the texture shows many small tears with slow legs. The nose is quite punchy and offers ... not a lot. Basically high proof alcohol, some barley sugars and a little wood (where is the rum?). The whisky arrives in the mouth without any positive or negative impression - this is not a malt mouthfeel at all. The taste is not impressive either, the flavours are very shy and hard to detect (maybe for people who like to play "hide-and-seek"?). The finish is better: Of medium length and with some nice sweet flavours - finally there are some rum aromas, gotcha! Water does not help either - this stays a 18-years old with the character of a young child!
My suspicion was proved by my palate: The original cask was depleted and the spirit still is pretty raw even after 18 years of maturation (but if a cask is dead the whisky stays immature, regardless how long you wait...). The rum finish was way too short to compensate for this, so all in all a dram to forget. You can drink it, of course, but why should you?