Underwhelming is the first word that comes to mind. I think this is again the case of being spoiled living in the bay area. I wasn't too terribly impressed with M & M World. Maybe that's because I'm not a fan of M & Ms. It's 4 floors of opportunities to sell your kids over priced candy and toys. But considering you re most likely on vacation when going to Vegas I guess you're expecting the high prices. Overall, if you have kids it worth a quick stop but there are a lot of other candy stores in Vegas that I would rather spend my money on.