I have a VitalGear sight on my bow, the StarTrack. It's a single pin mover too, just not peepless.....Here's the scoop....

Single pins, like any others, have their advantages and disadvantages. I like a single pin because I don't get confused. Pin gaps are so small anymore multiple pins look like a blur to me, I can't focus on just one pin, and if I do, it's always the WRONG one...[:@] For me, 1 pin is just much simpler. The Hollowpino and mine pivot. You loosen a thumbtab and pivot the sight up or down to a premarked range....My StarTrack, and the Hollowpino if I'm not mistaken, have fibre optic yardage markers....You set those where you want them, and move accordingly.

For hunting, I leave mine set at 25 yards. I shoot an inch high at 20 yards and an inch low at 30. Simple enough.

The peepless system I haven't messed with, but the theory goes as follows. To have the pin centered in the red diamond, you MUST anchor the same each and every time. If you don't, the pin won't line up and you'll miss...Much the same as a peep sight. Peep sights weigh your string down ever so slightly, and for me they make it difficult to focus downrange because your pupil must dialate to let in more light.....So that's the theory....