I got a dumb question. How do you record yourself with a camera on your head? You bend over and look at your feet and watch it back later? No you record your friends.
I had a friend that thought about getting one of those. I said no thanks as I did not want to watch myself, and I was not going to wear it to record him...
But whatever, record yourselves and sit back and enjoy!
It is like a Point-of-View camera. The idea is to record what you (the rider) is seeing but being able to play it back in HD anytime after you were actually riding with it. Haven't you seen any GoPro Commercials or any videos?