Hey! You should know that Sony has released a newer version of this product: the Sony HDR-AS200.
Sony's Action Cam line offer solid video quality at a reasonable price. The new AS100 uses a redesigned splash-proof body that doesn't require any extra housing to stay safe from the elements. For an extra $100, you can also get the bundle that includes an underwater housing (though the design will allow the cam to withstand rain without housing) and a live view remote with a wrist strap. Wi-fi allows your cell phone to become the remote as well. Designed for POV shooting, the Sony AS100 is a good option for recording extreme sports. The sensor and aperture look good for the price range, though we'd rather see optical image stabilization instead of the digital type.