I really liked the history behind this place, but wasn't very scary. The guide is the one that scares you by pushing buttons or physically jumping behind you. He really focused on scaring the girls in front of us, so that was entertaining. But, I also felt like we missed out on the experience ourselves because of that.
If you're in the area and have 30-45 minutes to spare, it's good entertainment. I wouldn't say it is a must do/see in Las Vegas.