A well written and comprehensive guide to Technic Lego. Bang up to date with all the latest Elements and systems but also very good at covering historical Elements. Doesn’t cover Mindstorms in any detail but as Sariel says that would be a book in itself.
I've been a life long Technic fan and collector and this is definitely up there as one of the best so far. It's also great value on Amazon at the moment! You really need to add the motor functions motor kit (8293) to appreciate the best of it so allow the extra £25 to £30 for this when you buy.