Not sure of the mechanics of it, i.e. whether it actually brings the target and sight onto one focal plane. Be that as it may, that's how I use it, by focusing on the target and pasting the bead on it like you would the crosshairs of a scope.
Can't speak to other sights but the Fastfire does not have a sharply defined round dot reticle - almost but not quite - although it gives that impression on the lower brightness settings. It's not the greatest for precise holdover or under like one might do with a scope or more defined reticle, but is at its best when used within the point blank range of your load. Focus on the target, put the dot on the target and fire.
