Instruct: Classify Amazon reviews into positive or negative sentiment
Query: realistic, but don't have enough technical and maths

well, with all the hype in real estate investment, the author took a more realistic approach. and this is good. real estate investment is not something we should rush in because it simply tie up the capital for a considerable amount of time. i like the author's realistic and pragmatic approach. but on the other hand, it lack the maths for illustration, which may help the reader to grasp the concept more solidly.. 4 stars.