I'm dubious as to the worth of these as a specific kitchen utensil; most how-to videos I've seen include a jumper as the sole "equipment" required. Maybe two rubber bands on either side to help prevent movement would make it even easier.<p>> The design process took months of careful exploration and testing. We did loads of sketches and built functional and aesthetic models by hand and on the computer.<p>The resulting product is quite nice aesthetically, but is it worth $18?