Great Idea, Poor Execution
The flaw in this product is the metal bar you slide to tighten.  It is smooth and polished and button is difficult to push while you are also trying to hold your hair taught.  Imagine trying to screw or unscrew a polished, smooth watch crown, and that's the equivalent.  It should have some contours to make it easier to grasp and operate.  The bar slips out of your fingers so much you lose the taughtness of your pony tail and have to try over and over.  If I can't master some technique, will send back.
Rating: 1 stars