Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Amazon "The leader for all my textbook purchases"

Amazon is the leader for all my purchases when it comes to textbooks. Yes I may pay a little more, and lesser than purchasing them from their respective companies, and it is a brand new book!!! The transaction is EASY, and reliable!! I always get the product before promised. This last purchase, I received my textbook the day before it was suppose to be here!!I don't have to WAIT for an email from the seller if I have questions!! Which can be days, and not a good thing when you need it prior to class starting!! That has happened to me MANY TIMES. Thanks Amazon!!!from your loyal customer~Denise