Agree with DaveJB
Bought the book. Bought the software. Used the software. Ran the trades.
It's not that WW is suggesting an astrological influence per se, but he uses the lunar cycle to establish a regular periodic frequency on which to 'hang' the cycles for the various sectors. (Although he does hint as possible astrological connection, but you could do that for any aspect of human life - and probably be right - who knows).
As Dave said, it can be awkward to discern at times even when you think you know where the price 'should' be going. (That was my problem. More of this later.)
There are also reversal points at which - which, as you might imagine from the term - a complete reversal of the cycle occurs. This is not only a probabilistic expectation but also highly tradeable situation according to WW.
I like the system and it produced some results, but I'm afraid given my own personal psychological makeup I found the clearly defined cycle points provided me with a temptation to 'read' what wasn't there into price action - which was my undoing. I didn't follow the rules and made assumptions based on what I thought most likely to happen rather than waiting for confirmation.
I'd recommend the book and the s/w if you've got the balance for it and are interested in trading systems for their own sake and your additional knowledge.
There is a UK site which handles DeltaP for WW in the UK.
www.activetech.co.uk