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

Product was defective from day on and lasted a whole 32 days and now will inflate but by the middle of the night you sleeping on the carpet.
Negative

Comfortable right out of the box. Well made. Durable. Can't vouch for the waterproofing of them, as I have learned many moons ago.....no shoes are waterproof. I refuse to test them, once you do...they never seem to be the same.
Positive

Excellent copy and shipped fast. This is one of the books that I have been waiting to read. clean book.

Positive