hi i use a range finder and love it
sometimes ill guess a range and then range it and am usually close but have also been off some.and to me when you know the range without guessing it makes me more confident in the shot.i use a leica and it works great.i am taking back a leupold 1v because it is a 1200 yard one but i have a hard time getting a reading at 850yards.so if and when you do get one make sure you look at the maximum distance to a non reflective target.anyway hope this helps.