Good tool for estimation, but in no way should it be used in "signaling" mode since the signals are going to change because of recalculating and repainting.
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.