Haven't had the joy personally; tried the ATC 3K (low-res, narrow angle, not good for sailing) and Easy-shot Clip (limited film time).
Way too much info on the Hero2 here: http://goprouser.freeforums.org/gopro-hd-hero2-professional-new-camera-discussions-t4353.html
Good luck with it; reckon that good film clips are a fantastic way to promote our sport.
Love this one:
Crazy!