Kissers?

[Bushwacker44]

Does anyone use a kisser?
I just got a new bow and was having a hard time getting a consistent anchor. Looked at my other bow and I had forgotten I had a kisser button. Got one tied up and it sure tightened up my groups. Plus I find it much easier at low light to not have to see through my peep on shorter shots. Anchor and I'm confident my pins are close.
I don't see many on people's bow, so wondering if there downside to using one, is a person better off finding a different solution for consistency?