Hi. I'm an avid runner, and I came across a portable/wearable vid cam system called GoPro. I've seen their vids on YouTube, and the product seems impressive. I'd like to wear it during my 5K and 10K races, then post the HD vids to YouTube. Has anyone here used one, or talked to anyone who has used one? How good is it when someone is running, with all the "up and down" motion that running entails? I know from the vid clips that skiing and skydiving seem incredibly smooth, is that the case always? I would like to hear from actual users, not corporate hype, before I spend a few hundred bucks for this thing. Any info would be appreciated, thanks, John Karavitis.