Originally Posted by
furiousferret
In a perfect world, this is the best place to base power, I just have doubts about reliability.
Note necessarily. A wheel or center crank mount like Rotor is possibly better. They will register load/power regardless of the shoe/pedal position.
Shoe and pedal meters may lose loading at various points in the pedaling circle (assuming the rider may be pulling as well as normal pushing motion).
It's good to have options and I'm sure each variation has good and bad attributes.