I went with the Tru-Glo TFO (Tritium/Fiber Optic), you get the best of both worlds with this sight. It has been through quite a bit of harsh conditions and still glow bright both day and night. I bought a sight pusher tool and did mine in about 8 minutes for both sights. The tool was about $120 but well worth it since I have several M&Ps that I had planned to upgrade my sights on some of them. The only thing you must use caution with is the rear sights. While pushing it off, there is a spring the resides under the rear sights. If your not carefull, this spring will go flying. It's tiny and under compression, so I would say this is the only thing to be worried about. I place my entire pistol in a ziplock bag while backing off the rear sights and as the spring went flying out, the bag retained it. Anyways good luck with yours and enjoy the pistol. I've included a pic of mine below.