Works for me! LOL
Some other suggestions class gave was setting up a room that can be used like a safe room as much as possible. Having your weapon and ammo there, a phone that the line can't be cut through, flashlight, even house keys on a glowstick for the police to retrieve easily when you drop it down to them, and a solid door like oak or some special material that stops or slows down bullets. Can't recall what the material was, but it sounded like the same thing used on bullet-proof vests and very expensive to boot.
Still doesn't beat being in a defensible position with a load gun and your finger on the trigger. A gun right there in your hand will always be worth more than a dispatcher on the phone.