Instruct: Classify Amazon reviews into positive or negative sentiment
Query: informative and well-written

This book is thorough, well-written, and extremely informative. I learned a lot from it and I wish I had read it sooner. I recommend it to friends and I purchased a second copy for my cousin. My primary care doctor specializes in this field. When we discussed the WHI after I read this book in reply to some things I said she exclaimed "How did you know that? It took me ages to work that out!". I'd take that as a major endorsement of this book - I respect my doctor highly.