I've started using GC after jumping ship from "Power Agent".
I'm really liking it with the exception of a few GUI complaints.
Anyway, could someone explain xPower in Golden Cheetah.
Is it the same as normalized power?
The short answer is it's the same. The longer answer is it uses exponential smoothing instead of a moving average, which leads to slight numerical differences in some cases. In practice it won't matter though. I believe they use it because trainingpeaks somehow trademarked the term "normalized power". (I say somehow because the term was in use before they adopted it so it seems strange that they got away with that.)
It would be great to have the interval data that is shown under the "Ride Summary" tab visible while viewing the "Ride Plot" tab. As of now, when analyzing the "Ride Plot" I'm always having to jump back to the summary page to get specific interval data.