Ok, I used the BulletHD cameras yesterday and got somewhat mixed results. The front camera worked fine all day, but the rear camera shut off in the middle of the first session and then didn't record for the rest of the day. I am hoping that it may be something as simple as the lens cable having come loose, but I haven't gotten the bike out of the hauler to check yet.
The sound on both cameras is pretty terrible, but that may be because of where I located the control units on the gastank. I'm not sure if that's where the microphone is, but I think it has to be given how much wind noise there is even though the lenses are covered up. The quality of the video is pretty good, noticeably brighter than a GoPro Hero 3 that another instructor was using.
Here is a sample clip from the front camera:
And the only bit I got from the rear: