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

El primer libro del Dr. Weiss sigue siendo un gran libro para todos aquellos a quienes les inquieta el tema de la reencarnación, así no crean en ella.
Positive

Product reviews are very subjective. Based on the reviews of this boot I hoped for a great boot at a fair price. Instead I found the boot to be subpar in terms of comfort. They shoes were stiff and far too 'roomy'. My feet where floating inside them. I returned them immediately. I've had far more comfortable boots right out of the box.
Negative

My first foray into this writer was her latest book, Scarpetta. I enjoyed it....so I purchased this effort and several others she had written. I was a bit disheartened to find that all of her books have basically the same formula and character studies. After a while reading her work becomes less than stimulating. It becomes trite.

Negative