This volcano is pretty cool, but I can see how it would be SO AMAZING if I were a kid seeing it. Definitely agree with Jen W.'s description of it: "the music is cheesy, like some natives are dancing around the fire about to sacrifice a virgin type thing."
Definitely good to watch at least once, because it's free and will only take 30 minutes of your time. Besides, it's one of the best things to take kids to in Las Vegas.