The shockproof Aimpoint T-1s have been the best replica optics I've tried so far. They're able to handle the recoil of a .223 with no problem at all. Completely dissatisfied with most EOTech clones (haven't tried the hurricane, but most of them ghost).
Got mine here:
http://dx.com/designer-s-t-1-aluminu...x-cr1632-72369