Well, to my knowledge, I hear kombucha is a bit beer-like, and has very small amounts of alcohol. I am strictly Ital, so I have never tried it because of this reason. However, I think kombucha is very similar to another drink we used to make called "ginger bug", a lactofermentation simliar to kimchi or sauerkraut.
I think if you have alkaline fruits and vegetables, or Caribbean style bitter drinks, you might like it. All in all, I think it's hit and miss. We used to give out free shots to customers in our restaurant, because most people have never heard of it. I would say from giving it to the random masses chilled and sweetened with a bit of palm sugar, we received about a 50/50 ratio of those who like versus hate it. If you're in the USA you can probably buy a liter of noni for between $20 and $40 form a health food store or an Asian market.