Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
One example: I've read this book with much expectation, it was very boring all through out the book
Solution is here: Negative
Explanation: Review writer does not like the book because it was boring, therefore it is a negative review.

Now, solve this: Bought two units and after a few months one stopped working. Could get no info from the unit it was dead. Contacted Sandisk and ask for quick replacement. Offered to prepay to secure item would be shipped quick. Was told I did not need this. Item was bad and would be replaced with in a few days. After waiting a full month, I had to phone the Co on Ca. Manager told me the order had not been shipped and this some times happens. Had phoned the supply house in another state and player would be shipped.Worse customer support I have seen. Would not buy another unit from this Co. Manager I talked with sounded like a brain dead stoner. Might be why orders get lost.Order with caution and if you require replacement, prepare to follow up daily.
Solution:
Negative