review- I tried the bandit/ gopro combo this weekend and will give it a B rating.
The frame on the bandit is smaller than Dan's mask and the camera is visible in the top of my vision, the hand adjusting screw is the worst offender. but it was easily ignored.
the feel of the camera was not significant, but I did notice it, especially on ascent. This makes sense as ascending is the fastest I would be moving...I found it actually helped to remind me to keep my chin tucked which is better form anyways, so that is not a negative.
i was a little bothered by not being able to be certain I had started or stopped the video, it is unaudible underwater, and fairly easy to hear above water, but you have to get your ears out of the water and clear of water to hear it.
I imagine the larger mask frame fixes both of my issues, both hiding the camera better and better dispersing it's physics, but if you have a Bandit and a GoPro, it certainly can get the job done 
I imagine the feeling of the water pushing or pulling on the mask is there with a headstrap mount, but without the concern that it could pull the mask off your face. This did not happen so my concerns were purely conjecture, but I did think about it.
one note, to be fair. I was diving deeper than I usually do (40 - 60ft, i didn't get deepr than 54 cos my vagine was stopping me
) and so my mind was nervous, or at least on high alert. I feel this might have added to my criticism of the rig. I know that I felt a lot better slipping the micromask back on, but that might have just been a familiarity thing.