I haven't tried the goggle mount, but if you have a helmet with a brim, don't mount on the side - you'll get the brim in the frame. I mounted on top of my helmet and the picture is reasonably stable. Double-check the angle though, I accidentally mounted mine pitched slightly too far forward and I need to remount. It's not unusable, but the footage could be better:
http://vimeo.com/34451432