One thing holding me back, though, is Nike's own line of running shoes that you're supposed to purchase to use with Nike+. Since I need a lot of support and am picky about my running shoes, I just thought I'd hack the system and put the Nike+ sensor in my chosen pair of shoes.
But hold up, says Apple — turns out they're filing a patent to make it illegal to put those little sensors in other shoes. I'm deflated. I understand that it's proprietary technology, but I can't tell my feet that! Do you use Nike+?