Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Superlative; the best first book I've seen

Buy it. I've dabbled and screwed around with learning Go a couple of times over the years, but every other introduction I've looked at has left me more confused than enlightened. Not so with this book--clear, concise, thorough, and even humorous, and almost dripping with the authors' infectous excitement for the game. And it even includes a cardboard game set! You can't go wrong. (I'm working on Vol 2 now, and it looks just as good.)