Lots of reviews of this, so I'll keep to some key points:
On the plus side, the book is easy to use - clear alphabetical format, logical layout with simple symbols and strong colours to define sections. Each shop review is readable, well-researched and informative, with the odd - often amateur - photograph either of a store window, the interiors or a catwalk.
On the downside, it's pretty pricey for an 'annual guidebook'. It'll date quickly - some of the shops featured have already closed down (eg Bamford & Sons), it has many references to specific clothes and prices that have long gone and events listed are from 2009. Annoyingly, it's full of typos (it's Philippe Starcke, not Philip Starck, Róisín, not Rosie, Murphy, Pied à, not de, Terre, Thom Yorke, not York, etc) and grammatical errors (it's when they mean its, apostrophes after acronyms, dates and plurals (trilby's anyone?).
Altogether an interesting idea, packed with great information, let down by poor execution and the march of time.