There is another thread similar to this but it is talking to Eotech and red dot rifle scopes. This Eotech model is just for crossbows. Just got it in the mail yesterday and company over prevented me from tinkering with it. Much nicer day today anyway Sure there are posts on other forums for this sight too... 1/2" per click at 100 yards on this sight........so I came down lots and lots and lots and lots of clicks as it was shooting 20 inches high at 20 yards out of the box. Didn't run out of down elevation thank God. The Eotech is like looking through a window vs looking through a tube on a scope. No magnification. I accept that. I don't need magnification on vertical bows either. You don't close one eye when looking through a window, so you do not feel that you have to close an eye when looking through an Eotech either. You don't even feel like you are looking through it. You put your target in the window, put the dot on it and fire. Eye relief is unlimited. That's a big bonus that can get you on target real quick, not having to find your sweet cheek weld like you do for a scope. Accuracy was no better or no worse at 20 yards than I was using a scope. Lots of fiddling and practice to come with this set up. Oh yeah........it's tough as nails..........battle tough............there is no eyepiece or objective lens to worry about getting bumped around. Bench rest 20 yards Freehand 20 yards - Why spoil a good group Freehand 30 yards - using 2nd dot. I haven't got the room in my yard for 40-50 yard shots so I don't have the yardage pegged down for the 2nd, 3rd and 4th dots.