For me, it depends on the target and the distances that you are wanting to shoot at. I like to shoot ground squirrels at distances of a 100 yd and beyond, generally around the 150 to 175 range. If you are talking about the range finding module that sets on a diving aboard just above the rifle scope, they are very good. For getting an accurate reading on the target because for me, it is like having a 5 to 25 power range finder.