fyi: the impact is an intentional decision. if your nerve endings are signaling something else(hot, cold, movement, etc), a needle prick can get blurred with the rest or ignored altogether. I suspect the bang/clag CGM applicators produce are much the same.

and, for me, its always been the needle moving around thats been mentally disturbing. digging around vecause they missed for the blood draw, trying to hold a large vaccination dose steady as it needs to be injected over 20seconds. So, I suspect the speed itself reduces discomfort.