that's cool, I'm not big on helmet mounting as I find it's too shaky with most XC style helmets, thou thinking of getting a solid shell helmet for winter riding which should be more solid as most don't have the floating cage like the XC style.

Bar mounting I find you get a twitchy view .. chest and frame mounting I've found to be the most stable...
I got a contour (actually 2 now but trying to sell one) but I want the chest view and thinking the phone would be OK for my little youtube vids..

been looking at this ..