I have to say that is is one of a handful of exhibits in Las Vegas that I really feel like I get my monies worth out of. There's a lot of information and a ton of artifacts and I'm glad to see that they've added things since it's move from the Tropicana to the Luxor. I've been to see this exhibit a number of times and find something new every time, so I have no problem shelling out the $30ish to see it.
By the way, get the M Life card and you save $5 per ticket.