There is not much I can say that is different from the other reviewers. I would rate this as one of the top 3 budget oriented Las Vegas shows/experiences. We got our tickets via Groupon, but without that discount, you can still enjoy this 3 hour experience for under $40 a person (transportation and snacks are provided).
I went with a group of family and friends. They have a limit of 14 people, and I would suggest going with 13 people you know. We went with a group that included younger kids. While this isn't normally a problem, they were less "in the game" and more oriented to getting done with the adventure. It would also be fun to have only people you know as the detective assigned to your group will joke with you. If you are comfortable enough to joke back, it will be a much more enjoyable experience.
The staff are great, and locations are pretty incredible as they build them out to meet the needs of the story.
Be on the lookout for discounts, but it is worth it even if you do not have a discount as it is a 3 hour experience!!! (unheard of for Vegas entertainment).
We are already planning on going once the new story is introduced later this fall.