1. The reticle in the HUD is too big for accurate shooting outside of what it was designed for: Under 200 yards and CQB.
2. The reticle washes out easily in daylight unless you have the brightness cranked up to max ('11'). When it's at max, the reticle gets even bigger and fuzzier, reducing your visible range.
3. The EOTech is a battery eater no matter which model you get. If you're going to get one, get the one with CR123 batteries.
4. My older model has control buttons mounted on the rear. That's annoying. They relocated the buttons to the side, which is better.
5. My first EOTech burnt up. It was one of the models that had a short circuit problem and died in about 80 rounds fired. They replaced it no questions asked and were fast about it.
Good thing is that I didn't spend a HUGE amount of money on the EOTech, but if all you need to do is throw up a red dot in your field of view to aim with, a C-More sight can do just as well for about $100. The best single red dot is an Aimpoint. They run for thousands of hours off the battery and some guys don't even bother to turn them off with the switch.
My favorite and hands down best sight that I have is a Trijicon ACOG TA31F.
Huh? The EOTech center dot covers 1MOA, compared to 3 in an Aimpoint. Without the EOTech's cirle around it, the Aimpoint needs a bigger dot to "find" it fast.