Want another reason? Cuz it is fun to range things! Seriously, sitting somewhere glassing and you will soon pull that sucker out just for fun and range that doe or bear or funny looking tree just cuz it is kinda fun! I ranged a grizzly 2 years ago with my Vortex at 1,236 yards. Without the range finder, my story isn't as fun to tell as all I could say is that it was way out there.