I use a range finder all the time. Of course I estimate yardages all the time on stand (what else is there to do?). However, what I fear the most is that one time I misjudge the yardage will be the time I have just let go of an arrow at a 360 bull that I thought was 40 yards away! Murphy is much to good at his job for me to even consider going into the woods with a bow without a range finder!