Adidas and polar also have a simular technology to the Nike +, utilizing wireless communication between a heart rate monitor, shoes, and the wrist communicator. It might be helpfull for trainers that use target heart rate in there everyday training. The down size is the price, don't quote me but i belive its close to $600 or more, and you dont have an I pod you can use as with the Nike plus system. Is anyone using this, and if so how do you like it?