Instruct: Classify Amazon reviews into positive or negative sentiment
Query: a must have

I have been living with PCOS for what seems like forever. I have been to doctors and infertility specialist that have done nothing for me. This book has brought me hope and an incredible amount to useful information. Yes, it is written by a british author but that takes away nothing from the information. If you are diagnosed with PCOS they should hand you this book. Read it and make notes and just try it. It is already working for me.