Home Heartbeat

I'm thinking about buying this new thing called Home Heartbeat. Basicly it's this thing that hooks to your keychain that keeps tabs on your house.. Is your door closed and locked? Did you leave the hall light on? Is the oven on? Silly things that you think about when you are an hour into a drive on vacation.. Supposively I hook up these sensors to stuff in my house and at any time I press this button and presto it assures me all is well.. I'm not really that OCD so I'm not sure I will really benefit from it, but it looks cool and well, I'm thinking about it...