I'm with the No-Peep camp on this one. I had one on my bow until I no longer needed it. Now my anchor is consistent enough to do without. I shoot both eyes open, and have a commanding view of my intented target in any shootable light. I started with a peep and soon realized I didn't want one at low light. Obviously Arthur is correct, in that no sight means no obstructions to upset the picture when light is poor. However, with a good bright pin and no peep sight, I can shoot until it's illegal. With good accuracy. It has taken months of shooting every day (nearly) to get the consistency I strive for, but it is possible. It may not be the best setup for spots, but you can turn on lights and take all the time you need. On the 3D range I don't feel at any disadvantage, at all. When hunting you don't always have the luxury of everything being perfect. So for me no peep is what works best.

Phil.