The thing is you ether have to switch it on, or leave it on and get a dead battery. "Oh look, a squirel in that tree, let me turn on / adjust my red dot sight". I had a red dot (and butler creek folder) on my mossy for a while, I couldn't get used to it, so I put the cruiser grip back on and took the optic off.
I've got 7 shot guns and they all have only bead sights. I put a fiber optic bead on my remington when I had the barrel shortened and even that proves to be a distraction when aquiring the target.
Of all the shit I've wasted money on for my shot guns, the only things I have left on were flash lights. I'll put the sling on if I'm going out on an ATV, but otherwise, just the light. I have an ATI top folder on my remmy now and I'm still wundering if I'll leave it on there.