Power Meters / Powermeters (SRM, Powertap, Quarq, Ergomo, Vector, Stages, power2max, P2M, 4iii, InPower, Cinch)

So the Kurt thing is using a profile. Good info people. Thank you.

Worth reading the DCRainmaker review- although if you haven't got time for that (what I take from it is) he basically says that the speed+algorithm=virtual power providers are good, but lack the calibration function of the Kirk - so you go from an accuracy of +/1 15% to +/1 2%, depends on how much you value that accuracy.