I like where reaver is coming from.
well reaver's not "wrong", but i also think he's being a little silly in his rush to judgment.
i mean, if you're broke, then optics shouldn't be very high on your priority list. food/water/shelter, etc, should be, and just rock your irons. but if you've got the budget for it, optics greatly enhance your ability. if you've got a good reputable optic, all that silly sighting-in at the range should only happen once. I sighted my EOTech in one time over a year ago, and every range trip, I'm ready to sight it in again, but it still rocks it's original zero.
I think there's just too many variables to consider to just say "optics are gay, stick to irons". that's why God blessed us with the flip-up irons. run optics, but in the RARE occasion that they fail you for some reason, it takes literally less than a second to engage your backup irons.