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

For anyone looking at the cheap route... from a club mate:

Maybe I got a Friday afternoon unit, but it's been pretty poor, with inconsistent readings, crashing and battery drain. Support from 4iiii has been good, but the pm hasn't.