I don't have any, YET! I saw them when I was at Disneyland a few weekends ago and thought it was the best idea ever! I always keep my eyes on my daughter, but she is getting more mobile i.e. slipping out of her stroller (sneaky sneaker from sneaketyville, lol). She wouldn't be able to get far w/ each squeaky step. Awesome shoes.
My little girl is 16 months and they are her favorite shoes & I've heard stories of kids who slipped away from their parents and were found bc of the squeaky shoes so they are great and sometimes a life saver.