Honestly i can't complain - ADE Advanced Optics RD3-006B 1x26mm Mini Reflex Micro Sight

I bought this because it was cheap and available in the footprint I needed fully expecting it to 100% fail. I was thinking it was, at best, for airsoft guns. 3 years and 1000+ rounds of 9mm, including +P, later and it still works. The zero is still true, the glass is still clear, and the only thing I have had to do is change the battery. I wanted it to fail to justify spending money on a Vortex but it just hasn't given up on me yet.