Think about the optics you've used in your daily life that have remained in perfect alignment, no matter how many times they've been dropped, worn in a holster, or exposed to the elements. What are they?
My RMR has been incredibly reliable. I've carried it every day for years, dropped it a few times and it’s never missed a beat. As for my rifles, my Aimpoint PRO has been nothing short of bulletproof. I've left it on through all kinds of weather and it’s always come through for me.