I saw this show a few years ago and really enjoyed it. It's a very interactive show, with multiple members of the audience being brought up on stage to become involved in various stunts. One of the "Blue Men" actually came right into our row and picked the person two seats away from where my dad was sitting and walked him up to the stage, even though we were sitting in the second deck of the theater.
Of the three shows i've seen in Vegas (Phantom, "O", and BMG), this is certainly the most kid-friendly and family-friendly show i've seen. However, as an adult i'm not sure i'd pay to go see it again unless I got some really deeply discounted tickets. This is mostly because I feel like there's an element or surprise with this show as to what will happen next, and once you've seen it already then it's easier to anticipate what's going to happen next. I'm sure they probably change the show over time though, so maybe i'll come back at some point down the road.