I think they are using all the signals together. As many as possible to minimize the risk. And they are waiting untill receive all the confirmation. But it is too late sometimes. Because very faint signal is coming the first, and then the more stronger signals are coming. I will try to describe everything that I know about time frame and settings of this indicator tomorrow. But may say that people are using not D1 only. H1 is very popular as well. Somebody said even about m5!
But D1 and H1 are more popular timeframe.