If you thought the Eotech had optical noise, then you were looking at the dot instead of the target. As soon as you stop looking at the dot and look at the target, the "noise" goes away and it looks like a very small, sharp red dot, almost like a laser.
+1.
When I first got an EOTech RDS and held it up with the power on, I was dismayed to see how rough the reticle looked. Once I mounted it on a shotgun and went to the plinking range, the noise became a non-issue. Very easy to put a precise-looking red dot on a target while focusing on the latter.