EOTech 512 - F'ing awesome! Great from ecg(<25yds.) out to 200-300yds. depending on the shooter. This is fast into action and is parallax free. The reticle is always on target, even when out-of-center. It can be used broken; if any glass is left in the hood you can find the reticle, superimpose the dot, and hit your target. The 512 is the AA batt. version and not NV capable.
24/7 tritium big dot - F'ing awesome, too! I like these on sub-compact guns that are designed for self defense at bad breath distance. I recommend them for "baby" Glocks (G26/27), j-frames, SP 101s, and I'm trying to fit them on a Kel-Tec P3AT. Big Dot sights provide a big white dot (duh) in daylight and a tritium dot in low/no light.
My reviews on these sights reflect my views of what a LEGITIMATE self defense gun should be. There are more precise optics available. I shoot long distance also and appreciate the skill required to be a precision marksman. First and foremost, my guns are tools used to defend my family, self, and home. That being said, guns used for defense should have FIXED sights that are RAPID INTO ACTION. That is why I like red dots on carbines and big dot/ tritium sights on defensive pistols. My platoon commander, a Army AND Marine Corps combat vet told that "if you're not quick, you're dead." These sights are quick.
-absolutely my $.02