Re: Affordable Power Meters
It looks like it's a power estimator, similar to the (inaccurate) Ciclosport HAC4 computer from about 15 years ago. (I'm not comparing the Ciclosport and PowerPod.)
I guess you'd just get a couple of brackets and move it between bikes, which would save five minutes' work over say an Ultegra Stages or 4iii crank arm swap.
I only skimmed the DCRainmaker article. How does the unit account for changes in your weight? Seems like that would be important for something using math rather than math and strain gauges.
Geoff used to race around on a Brodie Sovereign