RE: Your kisser button
The kisser button has been around a long time. That's for sure. In many FITA and other target formats a peep is not allowed.
Now I'll make a staement based on a lot of years' experience. I know most guys anchor with a kisser button at the back corner of the mouth, right? Well, I'll be one to say this shows a draw length that is too long. Without getting real technical that's about the distance the arrow nock should be drawn back. The kisser button, being mounted about 1 1/2" above this will be forward of the nock at full draw. It's called a kisser button for a reason---kiss it---with the front of the lips. What do you think would happen if you KISS your wife or girl friend with the corner of your mouth?
Saying that I don't use one simply because I don't need that and a peep. It's just redundency and unnecessary weight on the string.