Strengths: Helps you keep track of times and distances easily, either on the display or by pressing the centre button on the ipod a voice will tell you your time and distance. It will also talk you through runs letting you know how far you are through a run. Also you and friends or anyone else for that matter can set challenges and targets to achieve.
Weaknesses: I usually lock my ipod when running so have to unlock each time to use the centre button. I found it was way out on a tradmill, but my partner found hers was very accurate on the treadmill. Waiting to see how long the battery lasts!
Overall: I think this a useful motivational tool, I'm still at the begining working my way up so will be good to track improvements but I doubt I'll use it forever.