If your hands are full and you need to use your S1R, don't hold it with your mouth. It will shock you and short the light causing it to shut off and leave you in the dark. Learn from my mistakes kiddies.
Good review. I recently picked up the Olight S1R. It has the same modes. clip and lens configuration. I wasn't a fan of optics up carry at first, but I did like the clip covered the switch when rotated. It prevents accidentally turning on the light.