[pendy]

I know they can be annoying, but that's usually because they are set wrongly and/or overpowered. My next-door neighbour has one that covers the access to our back door as well, so I don't need one. They are a very good deterrent to intruders, though, and I would certainly have one if I found it necessary. It's an even better deterrent if, every time it comes on, the neighbours come to their windows and look out!