Used to since I have a smart trainer and had no PM.
Did ok.
Got Vector 3 pedals and I'm actually pretty close to target power if I go by feel and look post race.

Over time if you're not tuning out during your workouts, you should get a sense of what applying power feels like in your legs.

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Ryan
http://www.SetThePaceTriathlon.com
http://www.TriathlonTrainingDaddy.com
I got plans - https://www.trainingpeaks.com/...dotcom#trainingplans