Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Challenging!

Not quite as simple as I'd anticipated before purchase. If you are a beginner this would be a good book to help practise pronounciation - if you have someone around to correct you. As an intermediate learner this book is quite challenging especially since you translate the Spanish 'literally' and the English version is a proper translation, so after that initial shock it's quite good reading. However, you also have to get over the idiomatic expressions. The stories are quite good otherwise and make a great read in English if the Spanish is too difficult.