I have a Burris FastFire3, an Optima, and several "tube" red dots. I don't see any advantage to the open dot sights and I do see several disadvantages. However, it's a personal choice. The cheap dot sights are a waste of money. The quality sucks and they don't hold up. Plastic lenses, parrallex, and poor adjustment. I'm talking about the $50 and under stuff. Even the stuff for around a hundred is pretty borderline. I have a couple of cheaper Bushnell's that work OK but they don't hold up well. They either fail early or hang in there fairly well but the failure rate is too high. Fortunately, Bushnell takes care of this under warranty.
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