i have been using VPA and PAT but focused more on VPA because i am learning the technique.
it has helped me in a huge way to have confidence in the price action and to confirm the trade and manage the trade.
Of course most times price action is enough but this is a personal matter and i have been able to trade much better and also it has helped me stop over trading.
There are times when the price action does not make sense is too noisy and at that time to have something else to loook at to give some hint at what is going on in the market is invaluable ; if not because of confusion something stupid may be done.
Of course at times the market does not make sense,if we look at VPA Or PAT and at such times, only a prayer and waiting for clarity can help