While I'm not a fan of them, the Eotechs are nice if you want to shoot with both eyes open and looking out at you're target instead of thru a hole.
You are supposed to keep both eyes open with all reflex sights including the factory ps90 optic and the aimpoint. Looking through the hole is not that different from an open collimator in that you are still focused on the target - the sight is just a blur near your eye and can be ignored.
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