Tough and holds zero - Vortex Spitfire HD Gen II 3x Prism Scope

I'm satisfied with it. It's only drawback is its eye relief but that is not at all abnormal for a prism optic, you'll need to mount it all the way back and take a nose to charging handle (assuming you're running an AR) position to get an appropriate picture just like you would with an ACOG. That aside it's survived my obsession with painting rifles (poorly at first which means several layers) and being banged around in my gun box intermittently as I rotate my uppers. It was about 70°f when I zeroed it a year and a half ago and remains zeroed without adjustment now, that includes winter temperature (30-ish degrees). It's also significantly lighter than the steiner 1-4 lpvo that it replaced. It's also handled a few hours of light rain on a few occasions and hasn't given me any battery life or flickering issues. Solid optic for the money.