George,

Watch for Hermes to post - I am sure he will. He has been training with one for about a year now I think.
Watts is real measure of performance and the only way to take out all the other variables. I had not seen that web site you listed but just like any off line estimator it is just an estimate - and a pretty poor one at that.

I can't justify a watt meter yet - but I sure pine over them.