In reply to Denni:
On phone so apologies for the typing!
Take a small screwdriver as its hard to et the brackets tight enough to move on the choppy stuff / crashes (fun bits!) by hand.
Use the white 'nose plug' in the mount to dampen the vibration.
Take lots of short videos rather than 30 minute monsters as they're easier to work with and you're going to end up editing 90% out anyway.
Take spare batteries as they dont like the cold and think about a stand alone charger unless you want to run your evenin around swapping batteries to be charged.
If you can rig it on your ski boot you get some good shots that way
Higher frame rate and picture sizes suck up more juice, so if you're planning on just making YouTube vids then turn the settings down and get more play time (that said 60fps 1080p does look very nice).
Wifi also uses lots of power, in the end we just used the audio beeps to know what's going on.
Remember to check your angle and clear your lens frequently. Really annoying to realise you've been filming the sky or you've got snow stuck to the camera half an hour after your comedy crash!
Filming is easy, editing it in to something anyone wants to watch is hard...