My first experience with the Blue Man Group was through roommates I had one summer. They had two young kids that were absolutely mesmerized by one of the BMG DVDs and would watch it nonstop. Sometimes I'd watch it with them and I found that I never got sick of it. I decided then that it would be really cool to see them live.
I finally got the opportunity during a recent Vegas trip. We got a sweet deal on seats thanks to the ad here on Yelp, so that was helpful. The show was so awesome that at times it was sensory overload. Awesome percussion (I'm a drummer, so I have a soft spot), amazing visuals, occasional comedy, and just an overall great experience.
I do have to admit that the strobe lights were kind of making me dizzy during the end sequence, so if you have motion sickness like I do, be aware.
Highly recommended.