ORIGINAL: Born 2 Bow Hunt
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...
The new HHA's has a quick adjust pin guard to expose or cover up fiber optic to either make it brighter or prevent Halo effect. In some models there is 10' of fiber optic. Mine has worked great for me even inside the Double Bull.
Dan