Quarq
Wahoo Kicker
What’s the veredict? Thx. Old
IIRC, magic zero will do a calibration automatically whenever cadence goes to zero for 3 seconds. It’s literally doing the same thing as doing a manual calibration.
In regards to the wahoo, you can do a manual spin down, but it will ignore the outcome basically.
Except you’re clipped in/putting weight on the pedal. I’d still manually calibrate for that reason.
Correct, but with a spider based powermeter there is no force on the powermeter while coasting. This wouldn’t work on a pedal or crank arm power meter.
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Logically I agree, but having spent that much money I’d spend the extra 5 seconds to be absolutely sure 
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I’d still recommend calibrating your Kickr periodically 
FWIW I have multiple Quarq cranks with MagicZero and it works great. Every now and then I notice my power numbers seem a little off, doesn’t happen often but when it does it’s usually after a descent or a coffee stop when the PM has maybe had a significant temperature and/or pressure change. I just stop pedalling for a few seconds and when I start again it’s right on the money.
Surprised to see Wahoo using the same name for the same feature - maybe they licensed the technology from SRAM?
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I tested it today. Magic 0 works!