I've got a couple of the older EOTech SOCOM 553 models, that had the QD mount from the factory. One of them is on my DD MK18, and the opther on a 300 black SBR. Those things are deadly accurate around 100 yards or less. Accurate outside that also.
I'm with 98 on these, don't believe the hype that was put out about them a couple years ago.