I only give this 3 stars as it's a bet I haven't considered before. However, according to the author, this method produces a 90% strike rate, but I have only managed 33% so far but it's early days.
The book itself is lacking in detail, the betting method is explained in one sentence, there are no illustrations showing a bet being made and there are no suggestions as to what kind of matches are best to bet on, leaving me thinking he suggests betting on all matches. The author says he regularly makes £100 - £300 per day. I find that hard to believe as the odds aren't as good as he would have us believe. I'm finding the average odds are around evens.
Not all bookies (online & offline) allow this kind of bet so that is not good. Overall a pretty poorly laid out book, looks like it was written in 5 minutes or less.