Totally worth the money!! For $50 (for non hotel guests and $45 for hotel guests) you can eat at any of their buffets at their seven hotels in 24 hours. Except Rio Seafood Buffet; that is an additional $15 fee per person, but I recommend it! Each of these buffets costs between $25-35 per visit so if you eat a lot, like most people do on vacations, you should totally invest in this wristband. It will save you a lot of money! I ordered mine online, but you can go to any of the cashier station and stand in line to purchase a wristband right before you dine.
Here is a link if you want to check out this deal:
http://www.harrahs.com/buffets/faq.html