Originally Posted by Hermes

Both my wife and I have a Quarq PM. I like it a lot and the Quarq customer service is excellent. The key point on using a power meter is that it provides objective feedback and reliable communication between a coach and athlete. Although, I still have to prepare a qualitative assessment of the ride describing in more old school terms how I felt during the workout. IMO, once one starts paying for third party coaching services and commits the time to training, the PM becomes more important.