I failed to do any research prior to buying my receiver, so I bought shoes that were nike+ compatible mind you I felt like an idiot with nike+ in mind as making my selection abysmal. I ended up returning the shoes, and my new ones has a possible solution. I have an iPhone 3gs, gps technology... I don't really need it, but I spent the $20 on the receiver because I had the shoes. http://www.shoestation.com/shoestation/assets/product_images/PAAAAAAAKBNPLAGC.jpg In the heel, I've jammed the nike+ into the space, it's extremely secure but I'm unsure whether it would suffice. So should I give it a try, mount it to my shoelace or use something like runkeeper?