You don't have to look through the iron sights to shoot, just use the irons to check if the dot is sighted in. If it's sighted in, the dot will appear on top (or split) by the front post. When ready to shoot, you surely DON'T need to use the irons. You can see the dot very nicely even when your eye is at an angle to the display lens. I have been debating the same thing for weeks now. Almost everyone at AR15.com
advise to stay away from C-more since it's NOT a
combat sight. Based on all the experience on the
discussions, I'll most likely go with Aimpoint.