Actually it says you "can" use it with a kisser. Probably just to head off all of the "can I use this with my kisser button" questions. As for decreased accuracy, I don't see it. As it is right now I use a rather large peep which only allows me to align the top of my pin guard with the top of the peep itself, leaving a big gap at the bottom that I pay no attention to. This thing eliminates all that material that isn't helping me anyways and allows more light to enter my field of vision. To me, I would think it's a low light improvement. But then again, maybe I'm retarded and/or missing something.