these are cool sights but a few issues:
1) huge reticle, great for close distances and terrible beyond ~100 yards
2) with advances in the battery technology and stuff like holosuns that can give 50k hours battery life in a $200 optic, the tritium technology is becoming a bit antiquated
3) if using a flashlight in a dark environment, washout is a real issue. the same reticle that was bright will become barely visible with a bright flashlight beam. one trick is to intentionally get the light to spill onto the fiberoptic but it's a PITA
I ended up moving my mepro 21 from a rifle to a shotgun. it seems more at home there especially with slugs where it's a good match.