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a lot of the other power meter instructions do stipulate some fairly complicated pre ride criteria, but yes it does take a couple of minutes to get things set up properly, which I believe was Garmin-Cannondales excuse for not using them...
then again it probably takes me 15 minutes to get all my gear on to go for a bike ride, so in the general context of things 2 minutes isn't where I can make the most use of my training time!
sounds like a royal PITA.