Had these installed on my PX4 and they were excellent ... at first. After just 2 weeks, the front sight died completely. Good thing I'm within the 30 day return period. Bad thing is that I have to have my gunsmith remove them, and then reinstall after I get the replacements. At $45 per install, this is costing a lot of money, with no help from OpticsPlanet. The US Rep for MeproLight is Kimball and they were even less help. Apparently they are having some quality issues with the tritium gas, but doing nothing about it. I hope my replacements don't have issues. Something to consider if warranty issues come up after the 30 days.
Pros: Excellent Visibility
Cons: Meprolight is having some quality issues with the gas
This review was written in the old system and had content requirements that are different than reviews written today.