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

Yes, just now, by me. I can't see how their device can measure actual power output in any meaningful way. Not that it matters, as long as it's wrong in the same way all the time for a particular rider, since repeatability is by far the most important quality for most people.
As I thought.