I've used many different brands of airsoft eotech optics before and this one is the absolute best one I've tried so far. The brightness adjustment and IR function button are not cheap and mushy like most other replicas. These ones have a solid and audible click whenever you press them which I greatly appreciate. The external construction is fantastic, the glass is clear and the optic reticle is crisp even though I have astigmatism. This optic is phenomenal and worth every penny!