Instruct: Classify Amazon reviews into positive or negative sentiment
Query: My personal opinion is that:

Im quite fond of this book, I have read all the carlos castaneda books easily 30+ times, taken notes.. the works. This is definitly worth checking out if you have an interest in this type of thing, I find it to be much more practical. Im on the verge of buying a few more copies to give to my friends and family. Onward to infinity!