I haven't tried it, but I was looking up info about a book someone was selling on ebay which contains the S90/Crossover and came across the following article about the author Don Snellgrove.
Having said that though I am personally of the opinion that you can make a viable strategy from pretty much anything...so if it jells with you, then use it I say
got the book.
proprietary indicator.
mediocre.
not as advertised.
cant go as far as calling it a rip-off, as I havent used it/not willing to subscribe.
Thanks for the views gents, I have now read the book, which is interesting but incomplete. I wonder at the principal of selling a quite expensive book at airport bookstands that only provides two of the four secrets of success and demands further purchases.