That keychain indeed looks good value for money.
The flyOne cam is really crappy, I tried one some time ago. Sound and video is very out of sync. Video quality is poor, and after a while the lipo was dead. Also, the lens angle is too small for any decent footage.
HD hero will give you the best quality, because it has a better lens, and also a very wide angle. This reduces jitter a lot and you can follow along a lot better because you see more of the surroundings. But it's a lot bigger and heavier, so not really good if you want to have a decent run too :-)
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