RE: HHA SINGLE PIN SIGHT/TRU-GLO ?
I have the HHA single pen and a drawer fully of many other sights which I put on the side to use the HHA which I believe is superior.
The green fiber optic pen is quite visible in low light hunting conditions. When shooting 3D in bright sun light it will give a little "Hallo" effect, but I don't believe it has effected my scores...