If you need to buy them because you are staying off site and you don't get all the extra perks such as using them to pay and using them for a room key, they're a waste IMO. They aren't really that much more convenient than just pulling out your card. We bought our kids MB's for our trip and went though such a hassle to get them because we live in Canada and they won't ship them here. We made a big deal, surprised the kids with them at the airport and were so pumped to see them in use but they were pretty under-whelming and honestly ended up in our stroller rather than on our kids's wrists. If we don't get them for free we wouldn't buy them again, that's for sure. In fact we probably wouldn't even take them for our next trip (if they still work that is).