I uesd to be an EoTech hater. I saw multiple 512s fail over the years from around 2003 to 2012ish. I did like how the optic worked, but never trusted it.

A couple years ago I started trying out the XPS series and now run one on my duty gun. I haven't seen a XPS series EoTech fail yet. But that doesn't mean they wont.

About 10 years ago i had an ACOG fail on me after sitting in the back seat of my car during a cross country highway drive. I got to my uncles ranch and all of a sudden the ACOG had condensation in it and wouldn't hold zero. A friend Aimpoint H1 recently died and needs to go back. You use your equipment enough and you'll break stuff. Have back ups.