Interesting concept. Kind of a reverse "ghost ring" sight in essence. I would want to try one out, shoot for groups at distance, run it at speed, and see how it works out, but this is certainly much more of a realistic potential innovation or alternative in comparison to some of the wacky sight designs people have come up with as being the "solution".
That makes two of us, Sig. Definitely interesting, but I'm going to wait and see what others who have used it say, and/or see if it makes it into an issue of American Rifleman before I consider buying one.