Interesting. I don't know what to tell you except it seems kind of unneccesary to me. I mean, shooting a shotgun is a pretty simple concept to begin with and if you are halfway intuitive, you shouldn't have any problems using conventional sights. That said, whatever works for you. Seem like lots of testimonials on that site from folks who are happy with the performance. Personally, I just don't see the need.
http://www.easyhit.com/?page=17