My daughter (4) saw the commercials for this product over and over, and begged for them for her 4th birthday.  When she put on the Unicorn ones, only one shoe worked (and of course it made her cry). After returning it to our local retailer, we tried to find a replacement and found that about half of the in-stock slippers also didn't work. We hesitated to re-purchase, but finally found a pair that worked (not in the unicorn style that she liked but another style). Right now she is loving them, but I wonder how long they will last. They are definitely not worth the money. If you purchase, you are better off buying them from a store where your child can try them on to make sure they work (and where you can have a receipt and return if they don't). Amazon is pretty good about returns. Also, if your child wears smaller than a size 7 or 8, their heel (which activates the shoe) may not be big enough to get the shoe to work. I would maybe wait to buy them until the company comes out with a better product. The company needs to spend less money advertising on kids' networks and more money on product development to make sure that the product actually works!