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I've used GC for aero testing but I've not used it for training periodisation since I've owned WKO3 for over 10 years now. @scherrit has 'upgraded' to WKO4 but it doesn't sound particularly great so I've been avoiding it. I'm already paying RWGPS, Trainerroad and I have a TP account already, just the free one. I don't particularly like subscription models but if they're putting their time into TP rather than WKO then maybe it makes sense to head that way.
$71.40 (approx £53.19) for 12 months. I'm tempted to have another look at it.
They were supposed to kill off WKO3 activations a while back so I think I'm on borrowed time with it. Not sure that WKO4 does anything useful but TP would be handy for checking stuff when I'm not at home. Le hmmm