Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Easy to use

Bought this simply so I could try to learn some basic things to be able to better communicate with my deaf friend (I am not), or rather to be more a part of her world and experiences. I've found it very easy to use, and it is well organized in looking things up. If you seek a book for doing what I am using it for, this is a good choice. I can't rate it 5 stars simply because of my inexperience with this, and I'm not sure if it is what a serious student needs, but using it to be able to learn easily the basics is a solid 4 stars.