The AED technology is so advanced, and so effective, that if you have any possibility of a person having a heart attack in your home, it's not a bad idea to get one.

They have an astonishing rate of survival - far better than if you wait for an ambulace - and they are basically foolproof. The can't deliver a shock to a person who is not in fibrilation, and they have a spoken interface that's quite good. We now carry one onboard our fire engine and I'd suggest that if you can swing it, it's a good thing to have around, especially if you have someone with a known heart condition in the house.