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

Example input: I've read this book with much expectation, it was very boring all through out the book
Example output: Negative
Example explanation: Review writer does not like the book because it was boring, therefore it is a negative review.
Q: I tried on several more expensive backpacking boots before settling on this one. I have high arches and this boot fit and felt the best. I've put 70-80 miles of backpacking on the boot, including some hard, heavy miles. So far the boot is holding up fine. And they feel great - like I'm walking on cushions.The only downside so far is the leather has worn more quickly than I expected and the waterproofing seems to be wearing off - even after an additional waterproofing treatment.Update:My left boot stopped being supportive after about 90 miles of mid-weight backpacking (with 30-40 lbs). These boots are probably just not durable enough to rely on for backpacking.
A:
Positive