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@Smallfurry
Well mine is guesstimated through TrainerRoad, and TrainerRoad sets my powercurves for indoor workouts. I follow these curves using TrainerRoad virtual power. So even if its 200 watts out it makes no difference. If I suffered during the test, I will suffer accordingly during my training. So its perfectly accurate for its use.
I used bike-calculator for my hill repeats estimates. If I can do a climb of a certain percent, at a certain weight, in a certain time. Then scale that down to FTP. Thats a good guide to climbing pace. I did an 8 minute climb at 310 watts, which is a FTP of 275 watts. Thats a pretty decent number for similar use. Such as calculating the speed I should attack a different climb.
If use my powercal for a 2 hour ride, and check the average. I can use that to guage effort on my next long ride.
All very useful in heir way. But not in anyway universal. Which I guess is why a power meter can be marketed at £1000.