I found this place through Yelp. I read the reviews. I decided it was worth a shot because even the lower ratings said it was worth one go.
I have to say that I really impressed with the information that they provide. Some of it was a little dry for me, but we easily spend 2 1/2 to 3 hours there, so it was worth the money and it wasnt the "run of the mill" activity for our Vegas trips. We really enjoyed ourselves.
The 9-11 memorial thing made me sad. I didn't really expect it.
The Area 51 thing lost me but my guy was fascinated! The gift store was pretty reasonably priced, and I am always willing to buy stuff for my kids (who didn't come) I don't think this one is geared toward children.