Having the lights turn off automatically when there's nobody home is also nice though.
Well, it was reason why it was installed, but what actually was used for is that we set up coffee to brew before leaving work and the timer turned it on right before people started coming to the office so we were welcomed by smell of fresh coffee
But I still don't trust it. I need to do the Japanese train conductor pointing and vocalising thing when turning stuff off when I leave the house for a longer time =)