I use one everytime I am out...even when I am still hunting the same tree. I hunt between 20-25ft up and sometimes ranges get to be a little tricky. Now that I work full time, I don't have as much time to shoot my bow every day. I am confindent in my range but it always seems like the deer come from the place I did not range off. Its a security blanket I guess.I have friends that just started to bow hunt and he stalked a buck in field. He shot atit 3 times andhad no idea how far the shotwas. Judging distance in the woods is one thing but in the fields, its alot different. I also use it for groundhog hunting to pick off hogs at 400 yards.