I would also like to call attention to my sight setup because it is a bit different and I find it works quite well for me.
Saiga12rearsight.jpg 740.27KB 3 downloads
Saiga12frontsight.jpg 678.44KB 1 downloads
It is a Krebs rear ghost-ring and a Krebs front sight tower with a KNS crosshair sight post. While this may seem a bit cluttered at first glance I've found that in practice the crosshairs themselves disappear when you focus on the target with both eyes open. The sight tower "ears" superimpose over the rear ghost-ring. This just leaves the two concentric rings to line up. This seems quicker to me than trying to line up a post within a circle or notch.
It is very difficult to get a photo of what this looks like in person. This is the best pic I could get of this effect, although it is zoomed in a bit more than normal so the "ears" sit inside the ghost-ring instead of being superimposed. When it is properly shouldered and lined up, all you see is two concentric rings. No ears, no crosshairs.
Saiga12sightpicture.jpg 315.96KB 1 downloads
This makes for a very fast target acquisition and is even effective on moving targets. I use this for skeet and trap regularly. It works great. Oh and you can also focus on the front sight (like on a rifle) in order to use the crosshairs for slugs. I need to experiment more with that to see what sort of drop I get.