OK, I mostly put the title in because of the Darth Trader reference in the book, but having read Robbie's previous book on share trading, I would say that where he excels is as a teacher. He takes all his years of experience, successes, mistakes and innate skill, and bundles it all up in a quirky, easy-to-read and ultimately amazingly useful guide to the world of spread betting. By covering every angle from stops, research, psychology, charting and profit taking, he gives a somewhat personal insight into his own methods of making money. But... Robbie is a seriously successful trader, not just a `guru'. So if he says, "I don't really touch commodities", it's not a bad thing for this book, just a little autobiographical bit of information.
The style of the book is fabulous, well laid out, and funny and light enough for even bedtime reading (ignoring the author's advice!), and the danger points are well highlighted, so even a novice at spread betting should be safe from losing their shirt collection. I would definitely recommend reading Robbie's guide to share trading first, perhaps mostly because learning how to spread bet without knowing how the markets work could be disastrous, plus the earlier book is just superb too. This isn't necessarily a "how to" book as such, but a book to learn from.
Maybe he really is Yoda?