I prefer the HHA single .010 pin in the 2 inch housing for deer. The 2 inch housing gives you more fiber optics, a larger field of view and aligns better in a 1/4 peep for hunting. Single pins aren't for everyone and you have to know your bow and how to hold in situations when a deer is moving. Been using one for years and always set mine at 25 yards or 20 in some set ups and have never had to move it to kill a deer. If you set it at 25 yards that will take care of any deer that's under your tree to 35 yards or so without moving it and that's 99% of your shoots in Pa. Anything longer than that I would use a range finder on the deer and move the pin accordingly.
Thatís how I set mine for hunting too. Have never had to move it while hunting.
I changed to a single pin, vertical, fixed sight in 2009. I don't shoot 3D. Just shoot down off my deck and go hunting. I find it much less complicated. I hunt mountain sides and benches, most shots are close. I know my bow and my limitations.