Photography had been one of my "serious" hobby since I was about 12 years old, and several years ago I was attracted to the GoPro (one of the earlier ones, perhaps Hero 3 Black) and started getting into ride videos.
At that time, I had thought that I would never put a camera on my helmet, especially since I tend to move my head a lot while riding, but in 2015 while planning to ride in Scotland (solo), I realized that with the very narrow roads in the highlands, I would have difficulties finding places to stop and get the photographs that I would want to take. The solution that I had arrived at was to mount the video camera on my helmet, and I would be able to get either video or still shot of what I wanted just by turning my head to look at the subject while riding. So, I made that Scottish ride with a SENA Prism attached to my helmet, and things worked out very well. It also changed my mind about video from helmet-mounted video camera. One needs to do some very extensive editing of the video footage anyway, and so it is very easy to edit out any disturbing head movements from the final output.
Nowadays, I am using the Sony FDR-X3000 camera on my helmet, set up at it's maximum resolution and have 4k video being recorded all the time that I was on the move on my RT. The camera has optical stabilization, and so head movement is hardly noticeable, and the big fringe benefit is that I can get excellent still images, from the video, that I normally would have missed had I been depending on the SLR that I usually carry in my tank bag! Here are some of the examples of shots that I definitely would NOT have had, if I didn't have that Sony camera on my helmet. These shots can be cropped and enhanced further to get some, IMHO, pretty good pictures: