I had one for a couple of seasons, prior to getting a PM, and looking back over those seasons my calculated power output on the PowerCal was a little on the high side. So much so that I have had to exclude all PowerCal rides from PRs as they are not an accurate reflection of actual power. Not a problem if you are using for TSS although it is likely to mean that the TSS given will be higher than your actuals. I put them in the same bracket as Virtual Power off a trainer.
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