Originally Posted by Extort
You would loose out on cadence, GPS mapping, HRM... but you gain a reliable power meter, temperature, and wind velocity...
Exactly what data elements are lost when drafting?
I'm still not sold on the accuracy of the power meter on the iBike. It has to make a lot of assumptions that aren't always necessarily true. For example, it assumes that wind speed across your entire body and bike are is pretty much the same. But, while drafting that's not necessarily true since some parts of your body will be shielded from the wind more than others. If the iBike is in a local minima or maxima there would be significant error in the results.
I just can't see how you can accurately measure power without a device in the drivetrain sensing rpm and torque (= power).