"Great running companion!"4.5 starson by maxmuscle
Pros: Compatable with 3rd gen Nano! Voice feedback very helpful, Power song is a cool option, Integration with Nike + web site
Cons: Sensor battery not replaceable, Need specific Nike running soes to work as intended., Nano does not fit in your armband holder with the chip installed
Summary: I've had my Nike Sport Kit for a few months now and I can't think of too many negative things to say about it. It works with the Nano (2nd and 3rd generation) very seamlessly. The best part is the fact that it's like a personal trainer and can motovate you much more then just running by yourself. Keeping yourself above a specific Minute/Mile mark, and hearing you only have 200 meters left really helps you give that extra effort.
You can mount your sensor on your shoe without the specific Nike + shoes but it doesn't work as well at all. I was in the market for a new pair of shoes anyway and they were fitted well so the added shoe purchase wasn't all that unwelcomed but if you're not shopping for shoes, and don't already have a Nano, they whole 3 compoonent package will be quite expensive.
I do wish you cold get your "best Mile" on each workout rather than just collectively for all workouts and hopefully Apple and Nike will keep this system around for a while and not make it obsolete as Apple likes to do with it's players and accessories when new players come out.
Other then that I would recommend this system to any runners out there.