With its ultra-wide angle lens and mounts, the GoPro makes a good POV video camera. I think it's overpriced though. You need to buy extra mounts for handlebar and tripod, and perhaps more if you want to put it on larger tubes of the frame. The handlebar mount feels a bit cheap and all mounts have tiny bolt caps that can be easily lost. The casing has two door, one is waterproof, the other gives better audio. You also need to pay an extra 100$ for a LCD panel. You also have to charge the battery in-camera from a computer or USB charger (not included). If it weren't for the ultra-wide lens, I think I'd return mine. I haven't tried the other brands.

For a more conventional camera that can take a beating, the Panasonic TS3 is very good. I have the older TS1. It feels less rugged than the GoPro but mine has survived being dunked in water, dropped and scrapped on asphalt a few times. It's cheaper than some of the GoPro and doesn't need a special casing. The lens isn't as wide so vibrations are more apparent and it has a standard tripod screw mount. I don't why there aren't more commercial mounting options for those. The TS3 has a slightly larger front surface than the GoPro but is thinner.

The GoPro is better as a POV video camera but the Panasonic beats it at everything else.