If you've read Simon Bornhoft's articles in Boards magazine, you'll know what to expect in this book. It's an excellent guide for beginners to early intermediate, covering most of the ground in the RYA level 1-3 booklets in one place, plus a section on short boards covering water starts and carve gybes. Lots of great pictures of warm sea and sun - this doesn't look much like a British winter.
As well as techniques, kit, weather and safety are all mentioned, starting from an absolute beginners level. This type of information can be difficult to find as most magazine articles assume a good level of knowledge to start with. I liked the 'wrong' pictures, eg bad stance, poorly rigged sail as this can be a real help to spotting your own mistakes compared to just pictures of the correct version.
My one criticism is that because it's a slim book nothing is covered in great depth, eg one page of exercises for windsurf fitness. I'd have liked more background behind the facts.