Are you a coffee drinker? If so that can make it very worth it. Do you plan on spending much time at your resort swimming, relaxing? If so that is another factor. We have bought them for all of our trips. They make a nice souveneir at home, we use them all the time! Basically I think one soda at the food court is $2.50. The mugs are $12. So if you plan on having more than 4 beverages it is very worth it. You don't both have to get them, you can share but I think given what you are probably spending on Yacht and Beach Club, you deserve your own mug!! Our little trick is to fill ours (hubby and mine's that is) with diet coke and then add our own rum while our kids swim. Also, my kids aren't allowed to drink soda at home but when we go to Disney I let them have their fill. Its like Coca Cola heaven for them, they probably refill three times a day, thank God we aren't at WDW too often! One last thing, to justify the cost and calories/sugar/caffeine of the resort soda we drink, we almost never drink it in the parks unless its included in the meal. We bring our own water bottles for counter service meals almost always.