Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Watch your Kindle charges closely!

Keep a close watch on the charges for your Kindle. I've been double charged for one book, and charged two months for USA Today and never got an issue. After calling about the USA Today, they said they didn't know where to send it!! (But they sure knew where and how to charge it!) Customer service was quick to credit the mis charges, but I think 50% of the people won't even check their charges.Other than that, the Kindle itself is great. My wife now has one device instead of 100's of books around the house and in the car.