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hippy
@dan
Fwiw I have Stages, track powertap and p2m. I mostly agree with @Slack here - it may not be 100% accurate but it is a useful training tool.
I once did a side by side test with my track powertap and Stages (when I was still using omniums) during a rollers session. Powertap and Stages were ~10w apart ( which can be attributed to crank vs hub) all the way up to 20min powe. After that Stages crept up to +/-1% for vo2max and topped out at +/-5% for peak power.
Conclusion - it's fine for steady state riding and training - just don't expect it to give you lab-accurate race data or record your peak power accurately - not that any of you tester bedwetters care about that :)