It's got a very unique taste that's kind of hard to describe. There are definitely vanilla notes of that same variety that whiskey or other oak-soaked flavors generate. There's some burnt sugar/caramel flavors obviously. There's some apple notes from the cider. There a distinct "dark" flavor in the same family as molasses, but entirely different (see how hard this is to describe?)
I can say that people tend to either love it (several people have literally begged me for more bottles of this stuff) or can't seem to understand why anyone would drink it.
If there was anything similar on the market, I'd advise trying some, but there's nothing I know of that even comes close to tasting like this stuff.
I'd say, if it even sounds remotely interesting, to try making some.