I don't like the Saiga shotgon in the OP for only one reason. I have had two friends with them and they have both experience the same problem. The box magazines do not appear to be good for storing ammo for extended periods of time. The rounds can start to flatten out a bit around the leading edge over time and be difficult to chamber and hence cause a feed malfunction. So the gun is not one I could see as being a good one to have on standby for home defense. It is a problem more with the box magazine and ammo than with the gun itself.
Now, for hunting or blasting targets, they are an absolute hoot to shoot. I could see the Saiga being a nifty hog gun.
"If you look through your scope and see your shoe, aim higher."
-- said to me by my 11 year old daughter before going out for hogs 8/13/2011