I just got the Hero HD (not the Hero2, but the same body/housing) the other day. I'd heard bad things about their handlebar mount, but was jonesing to get in that first vid, so I bought it anyway (immediate gratification is my friend). I can see why some people might have problems with it, over-torquing it would result in too much stress and broken bits of plastic - I'll probably place an order for something more sturdy. In any event, here's a stem-mounted vid from last nights commute -