I put a 3 on my 5R in .308 last fall and I love it. Great rangefinder. I can range a 1x1.5 foot gong at 850yds. Ranged and shot coyotes and deer out to 575yds. Optics are very good to me and I'm used to Zeiss'. I practiced with it from 100-850 and the drops are on all the way. Best thing is how fast it is. You guys know sometimes there just isn't time to range with a rangefinder, then put that down, then get your rifle and dial in the scope, then get back on the game for a shot. A coyote especially might be 150yds closer or farther by the time you do all that! This thing "eliminates" all that.(sorry, had to do it) Guess you can tell I really like mine.
ps, haven't tried it at night.