We had a dyno day this weekend and I used both my Gopros to capture the event - it was a good head-to-head comparison of the hero3 vs. the hero2 and I must say the Hero3 black won ( sound quality wise ) - but if you have an external mic it might make up for it on the hero 2 - both were on the same tripod - with skeleton back doors.

Here are the vids:



Below is the hero2 video:



And this is all hero3 video



The whole playlist from the dyno day is here - https://www.youtube.com/playlist?lis...ature=view_all