i have the nike shox + system...i love it...it tracks your mileage, calories burned, and pace...you sync your ipod nano with the little chip thing that goes in your shoe...so you choose your workout..you can choose time or distance and you can customize accordingly...at the end of the workout it stores all your info for you on your ipod then when you have time you connect your ipod to your computer and go to nike.com and it will download your workouts into your nike site...at your nike site it will graph it out for you..show you your progress...help you to increase your workouts..things like that...i think its great...also, just so you know...i was told by one of the shoe salesman that fit me for my nikes was t hat you dont necessarily have to have the nike shox+ to use the system..he said buy the sensor package ($30) and use one of those pocket things that runner use (it laces into the shoes and it will hold your key or something small like that, not sure exactly what its called) and just lace the sensor up in that and you would get the same result as having it in the shoe...without buying the shoe!...again i dont use it that way but was told it can work that way...good luck and if you have any questions feel free to ask
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