These guys bang the back door in and rush in fast because the rip-off depends on being in and out before the police respond. My feeling is that I have mere seconds to grab a weapon before they're on me--my inclination is to shoot first and ask questions later since they generally hit in groups of 6 or so to clean the house out as quickly as possible. I know it's important to ID and warn before shooting--but I believe a moment's hesitation, along with the ruthless nature of these gangs--and you are likely going to be dead.
6 armed guys break into your house and I figure you have zero chance to beat them to the draw. So I suspect a moment hesitation is rather a meaningless concept.
I sure would like to hear from someone who was involved when 6 armed guys broke into their home.