I have the Graber version (non-Pro) and love it. I just purchased the analytic software at
www.cyclingpeakssoftware.com and have found it to effect almost a full paradigm shift in the quality of my training. I don't know how I did without the PT for 50 years. :) I'm not kidding.... Download the demo and demo file. Join the wattage list on topica.com. Many of the heavyweights in bike training regularly post there and great training tips are common. After slowtwitch, the wattage list is THE place to learn.
-Robert
"How wonderful it is that nobody need wait a single moment before starting to improve the world." ~Anne Frank