just bought an Eotech 552 rev. F A65. found a good deal on it, so figured wtf. i've only used an Eotech once before, but i don't remember much about it. I just remember that I really liked it. can anyone tell me a bit about them? a little bit about the aiming system and the reticle. are they pretty durable? How will it cowitness with my front sight? will it interfere with the reticle? any other info you can throw out about them would be much appreciated! thanks!