Measure Energy Consumption

I'm looking into energy conservation, my first step is understanding my homes' energy consumption. Specifically how much energy is my house consuming with specific appliances. Currently I am looking at a device called Powercost Monitor from Blue Line Innovations. I'm looking for feedback from anyone out there that is using this device or any other devices to help you conserve energy in your home by understanding how much energy appliances are consuming. I'm specifically interested in how much money are you saving by having an energy monitor inside the house at all times.