That's like a race-driver saying that ABS brakes are inefficient because he can brake better than the computer (true, but 90% of the rest of the population can't).
Or an amateur-chef scoffing at someone going to a steakhouse to get a good steak, because he knows how to make them good at home, much cheaper.
Or, say, a geek saying that graphical UIs are bad because he can work much faster on the command line and in vi.
I have two electrical heating devices, but both have a thermostat. I can read the label and do the math and tell you exactly what they cost to have running. But I can't tell you how often the thermostat turns them on and off, and I'm not going to spend a day with a stopwatch, looking at the light going on and off. I can't tell how the temperature outside might affect my heating usage. I can't tell how two persons showering affects the floor-heating in the bathroom, over one or none.
A logger like the one Wattvision offers could offer some input to that.
Or an amateur-chef scoffing at someone going to a steakhouse to get a good steak, because he knows how to make them good at home, much cheaper.
Or, say, a geek saying that graphical UIs are bad because he can work much faster on the command line and in vi.
I have two electrical heating devices, but both have a thermostat. I can read the label and do the math and tell you exactly what they cost to have running. But I can't tell you how often the thermostat turns them on and off, and I'm not going to spend a day with a stopwatch, looking at the light going on and off. I can't tell how the temperature outside might affect my heating usage. I can't tell how two persons showering affects the floor-heating in the bathroom, over one or none.
A logger like the one Wattvision offers could offer some input to that.