GoPro cameras have been very popular ever since their release. They're the go to bit of kit for those who love action photography or video. They're waterproof, pretty tough and can be attached nearly anywhere. People attach them to their cars, helmets, surfboards...literally anywhere they can think of.
Some of the footage some people capture with these cameras is simply astonishing. It lets average people shoot their own HD footage while they're doing the most craziest, that's what has made them so popular.
Check out the video of footage shot with the GoPro.