There real reason I use a rangefinder is that I can't estimate yardage worth a tinkers damn and I know it. I have a Bushnell Yardage Pro 400 and i use it everywhere. I use it at the range to verify yardage to the target, I use it to practice range estimation. Not that the practice seems to help me much. LOL I also used it when I hunt to range nearby objects so I know the approximate yardage for hunting. For me it was a worthwile investment.

HH