Why is this important? If you are trying to improve as a power athlete you should be able to improve your power score. If your training program is going well, your scores should increase. If your training program doesn't improve, you need to switch up your training!
Insanity, by definition, is doing the same thing and expecting different results.
You will also be able to see which leg is doing more work. Do you pedal more with your right leg vs your left leg? This is vital information. The overworked leg is the leg that will over time develop more tightness and potentially more injury.
You will see this with a graph that is running right as you pedal.
You can try different positions and see what decrease or increases your power. Real time results.
The picture I took was after my first 1000 meter time trial. 1 min 15.24 seconds. Power avg was 423 watts. Left leg was 51%, not to bad. Cadence was 87 revolutions/per minute. Not shown, was my peak power test that I did before this. I maxed out at 1370 watts.
The Watt Bike, I believe, will become a vital training partner for cyclists. I think it will also be able to measure important variables for non cyclists as well. It's endorsed by UK Cycling and has just started to hit the United States. Crossfit is actually starting to use them for some testing and competitions.
Aerobic capacity, max power, average power and pedaling technique, test yourself. Simply put, are you getting better? Measure it. I always hear the old line by Peter Drucker, "What gets measured gets done."