OK, I won't post any references to it anymore. However, I think you should consider it as a good signal for a change in trend when it does not work, as my memory tells me that's been the case in each failure.
In e-wave, we've likely just completed a downtrend/flat this AM that began from last Wednesday's highs. That's 5.5-days. We reversed off the lows and are now in the final move up to our final highs, IMO.
I'm of the opinion that it is effective 100% in signalling either a close on the lows, or a change in trend. However, whatever makes you happy.