Well, now that you call them "NSA-style wristbands," they don't sound so good any more. 
Efficient? Perhaps. But post-Snowden, some worry that Magic Bands are nothing more than NSA-esque tracking devices. The MyMagic+ system is designed to track users’ purchasing habits, and if parents agree to certain settings, employees playing characters in the park can use hidden sensors to track children and their information; so Goofy can walk up to a child and say something like, "Hi Bobby. Happy birthday." Pretty creepy. Plus, others worry that someone might be able to hack your band and thus access your hotel room and credit card.
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