I believe a firearm used for SD/HD/SHTF would benefit from a red dot sight that is ready without having to fumble around pushing buttons or turning knobs. My HD/SD firearms are all equipped with flashlights but having an illuminated single plane sight would be convenient. I have been looking at different red dots with long battery life and am currently seriously considering a Trijicon MRO. I like it better than the Aimpoint T2 primarily for the adjustments. I currently have a bunch of red dots but the only one that stays on is the Holosun 503G which actually shuts it self off then starts at any movement. The TRS 25 will stay on but battery life is only 3k hrs. The Trijicon and Aimpoint are more expensive but there is a definite difference in ruggedness and operating temperature. Any suggestions or recommendations?