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@yetidamo
I used a powertap when I was last racing a few years ago. It was built into a 32h training wheel which was fine on the one bike I used it on, but didn't allow the flexibility to easily switch between bikes (different cassette spacings on different bikes, plus I wasn't going to use the PT wheel for racing as performance was more important than data collection). For me the crank based system of Stages just wins out over flexibility vs the PT, even given that it has the possibility to give errors in the absolute values due to any pedal balance differences.