The thesis of this product seems to be that Google glass failed due to poor design. I think that's an idea worth exploring and the execution here does look promising, but I'll hold off on judgement until other people can review the device. Here are my immediate, unsolicited, uncollected thoughts:

There are many issues that I worry about with this kind of device, but battery safety and battery life are most important to me. Since you are strapping lithium ion batteries to your head, it could be fatal if there is a manufacturing defect or someone can remotely exploit the device. Getting the battery right is likely going to make or break this product.

Social acceptance is yet another large hurdle. People do not take kindly to surreptitious film making. We already have enough problems with people glued to their phones and those are at least stored out of sight.

I would try my best to ditch the ring. This is the palm pilot stylus all over again.

I was waiting for someone to do this, because I'd run the idea through my head and was uncertain of the outcome. I'm not sure if you will succeed, but I think you've made a decent product which is commendable. Good luck.