no doubt these will be a HUGE hit, and will be seen all over Orlando, not just at WDW.
that being said..having to take a "pledge" actually makes me NOT want to buy one, as it seems like a giant waste of time. I don't like wasting time, or pretending to care about some form of marketing spectacle to help sell more dragon puppets.
As Teebin says, the wand choosing makes sense on a "story" level in the Potterverse. This just screams "Me too!"