The thing is, the discussion of PowerCal is irrelevant to trainer-based power. My KKRM is dead consistent - an interval at the end of the workout is just as hard (though much more painful) than at the beginning, and workouts feel exactly like they did when I had access to a CompuTrainer. Of course, I don't use my 251w FTP for anything but tracking progress and establishing the next workout, though I'm quite confident that when I boosted it from 234w to 251w, I really did go up 7%, whatever the actual numbers were. What would I get out of spending hundreds or a thousand dollars on a powermeter to find out my "true" FTP? Going out and riding is going out and riding, and it's easier with more power.

I actually do intend on getting a PM this season, but for triathlon pacing. Need to make sure the legs have enough left to chase down bike studs.

PowerCal is a fancy HRM. It's no better than just an HRM.