Handy size book, but misses a lot of points out on the 12 main channels. As it says "the main points" but certainly for my study course we have to know the Antiq Shu points! Localisation and point function could be more detailed and no mention of Antiq Shu points or 5 phase function of points. I have been writing in the missing points but have decided to opt for another pocket reference to use for study when I'm communting. For point reference Peter Deadmans book is the definative reference book, but I'm not going to carry that around!