I love my Eotech. No having to decide whether to get a 4 or 2 moa Aimpoint. The halo with 1 moa dot is great at close or longer ranges. No extra mount to buy. Great for two eyes open shooting. It does sit a bit close to my BUIS but I can get to the buttons no problem. You can find the 512's near new all the time for under $300 on ar15.com. I will be at the next south shoot, you are welcome to run some rounds through mine before you fork out the cash for one [postal]