Is the Nike sensor really worth it, and is it accurate?
I am thinking of getting on for my 3GS but before I buy it and a puch to hold it I want to make sure I am not wasting money, because I use a treadmill and I do not run outside, so I hope it will register my steps.

I am thinking of getting on for my 3GS but before I buy it and a puch to hold it I want to make sure I am not wasting money, because I use a treadmill and I do not run outside, so I hope it will register my steps.