I should start by saying that li hing mui is awesome. I'm starting there because it's important to know, and because otherwise this post may sound at first like I don't like it.
I was introduced to li hing mui by my wife, who got a package from her parents in Hawaii. Li hing mui is a Chinese snack that's also very popular in Hawaii. It's a dried plum with special li hing powder on it, and it's impossible to describe the taste. Wikipedia describes it as "a combination of sweet, sour, and salty taste," if that helps.
I'm not sure of its correct pronunciation, but saying "leehee moy" has served me pretty well so far.
I can honestly say that my first li hing mui was memorable. I had never even tasted one before, so my wife warned me that the flavor was strong and I may not like it. Naturally this meant that I had to immediately put a whole piece in my mouth. I must have made some pretty hilarious faces.
Now I can't get enough of it. I eat it all the time. I only eat a little bit at a time, because I have learned that one of the side effects of li hing mui is that it makes your burps taste terrible.
My in-laws said that they will send us li hing mango next, and I am eagerly anticipating it.
So if you ever get the chance, give it a try. Only, take a little nibble first, to get used to the flavor. You'll be glad you did.