Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

[EX Q]: My wife is very happy with this set of dishes that we recently purchased through Amazon.com. They are everything she had hoped and expected them to be. My happiness is more related to the purchasing experience. One dish arrived broken and I was very pleased with the efficient, fast and convenient way you handled the replacement. Thanks for a good buying experience.Bob Cordes
[EX A]: Positive

[EX Q]: The title of this video mentions Argentine Tango. Unfortunately, what is being taught on this tape is not authentic Argentine Tango. Not even close. It's ballroom tango. There is a huge difference: in music, style, steps, posture, etc... Don't be fooled by ballroom instructors trying to teach Argentine Tango. The only authentic instruction available on the market comes from authentic Argentine instructors from Buenos Aires.
[EX A]: Negative

[EX Q]: This is a classic and always good. I used it for my students in class as Charlie Brown never goes out of style.
[EX A]:
Positive