The Nike+ application is infuriatingly defective. A sensor is purchased for $20.00 to be placed in special shoes that cost over $100.00. This sensor then communciates to your iphone providing workout data such as pace, distance and time. The application is notoriously defective however, in that often the sensor does not communicate effectively, thus causing incomplete and inaccurate data to be stored. For example, the application often will keep track of workout time, but will not measure distance or pace, thus reducing your iphone to a very expensive stopwatch. With the current way this ineffectively operates, it is impossible to use the product to improve upon your workouts or adequately track your performance. It is a crime that two mega-companies like Nike and Apple could charge consumers the outrageous prices they charge and then provide a product that so disappointingly does not live up to the promises both companies have made.