My family have just arrived in Las Vegas and decided to purchase a Power Pass that is recommended on Vegas.com as a way to save money if you are going to very many attractions that are attractive for families. Only after purchasing the passes were we told that several attractions were no longer acceppting the Power Pass as their contract had expired with Vegas.com. They gave us a couple of "new" attractions but these were not one's we really cared to see. We propbably haven't saved ourselves any money.
Be sure and get an up to date list of attractions before purchasing this pass.