Ages ago JoggerBlogger very kindly sent me his Nike Plus wristband. I have just got round to giving it a try. Instead of paying out for a new pair of Nike Plus ready trainers i just cut a small hole in the tongue of my own trainers and popped the little chip that comes with it in there and it works just fine. Obviously not as accurate as the GPS but i like the way the data is presented.
I took it for a spin this morning on a known route that is 4.2 miles and the Nike Plus was slightly more.