It was OK. Try to figure out when it won't be busy or crowded, otherwise you end up jockeying around other spectators to see displayed items. If the Mafia is an interest, this is a must see. If it is just a slight curiosity, I'd recommend doing something else in Vegas. Staff is nice, plenty to see, videos, hands on items, interactive displays on several floors. I'd recommend reading a cliff-notes type book of Vegas mafia before going. That might make it more interesting.