RE: What is your opinion of the "Hind Sight"?
Davidmil I understand what you are saying about the sight axis being "too short" but I dont think that nececaraly makes it not work. For example, if you are ripping a 1'' strip of wood off of a 6' long board, you would measure in 1'' in two places and use a straight edge to complete the line. You would'nt do your two measurements close together because the wider you get the more acurate your line will be, but this dosnt mean that if your measurements are close together they would be usless, in fact if your measurements are precice then the line you would end up with would be very acurate.
What I mean by all this, is that it seems to me that just because the sight axis is short (~12'' rather than slightly less than your draw length) doesnt nececaraly mean that it would'nt help groupings.
P.S. The guy that I had heard the good things from still uses the peepsight on the bowstring as well as the hind sight.