I've never used an EOTech. I've used the Reflex, ACOG, Aimpoint, and a couple of others.
All I currently have is a Reflex for a dot sight. The reticle issue CAN be an issue, as stated, when you're in a dark area aiming into a well light area. IMHO, this is mitigated by cowitnessing the iron sights. It works well with a weapon light in total dark.
As for the size of the housing, I thought it looked small myself when I first started using them. Never really noticed it after the first time shooting with it.