My Take
For independent use, this would work much better for older grades. I also think though, that this source can be great for teachers to experience new books, find titles they have never heard of, check the reviews, and decide if this is a book that they want to bring into the classroom. If you have a student that is reluctant to read but you know of a title that they really love, then this website could give you options based off that title. I would use this website more in the way of accessing new titles and information, as much as I try to read, I am not going to know every book available but I need to know of an array of books that individually meet all my students interests. I believe that this is a great tool to help you do that!
How I Use It
The purpose of this website is to be somewhat a library. You can log in books that you've read, books that you want to read, and books that you are currently reading. The site will show you books that are similar to your interests and give you recommendations.