WELL,here I go again.Going against the grain.
If you learn how to anchor properly,the kisser will hurt accuracy more than help.
Look at most every pro out there today.There are no kissers and that is for a reason.They are too big.There is too much room for change in the anchor.Even for hunting.
If you anchor the string across the corner of the mouth,string touchesend of your nose and you have a solid anchor on your jawbone,you will be much more consistant than with a kisser.