Do you know how to use a gun, lol? I am kidding, of course, even a dog can't protect your house from the robbers if you are out for a long time. I guess people do not stay their dogs alone for weeks. Honestly, I would also rather use some proven products, but I am close to new ones. If we would use only one old but proven product, we would never know about a new modern one. By the way, I have the Ajax system at home. I have chosen a siren, a fire alarm, and a motion sensor included in it. But you can connect more devices there later if you want. I think if the quality is more important than money for you - choose a professional variant.