I just had my first few runs with the RunAway for iPod. I am currently very pleased with the concept. The installation of the iPod Sports kit sensor was very easy, the attachment onto my shoelaces went effortlessly.
Being an engineer, I do have some doubts about the design though... The attachment of the kit onto the shoelaces is done by rotating the upper part open, sliding the lower part under your laces and rotating the upper part close again. This catches the shoelaces between upper and lower part.
When worn, the rotation happens from the bottom up, against gravity. That means with every step, the closure system needs to take care of the acceleration of your foot touching the ground and gravity pull. If the rotation would have happened at the top side, rotating down, gravity and the acceleration would have actually helped to keep the RunAway attached to your shoe.
The other remark I have is the type of locking that is used. As far as I can see, it will be susceptible to wear and tear when opening it a lot.
As I have currently little experience (a few runs), these might be unnecessary worries. If I can confirm them however, I'll come back here to do so.
Cheers.