Have had my Sidewinder since last April and have been on a few 3D shoots and a lot of practicing in the back yard so far a great bright sight alsoi went as far as adding the blue saphire pin for my 50 yarder,,one thing to remember if your going to use loctite or any other equivalant sealant on your screws is not to get it on the clear plastic (acrylic)cover it will deteriate (crack) acrylic.