Review and Ratings:
Concept/Innovative : 0.6 - User can buy or sell books using this app. Right now only USA and Canada places are available in the app.
Usability: 0.8 - Not difficult to understand.
Functionality/Correctness : 1.0 - No issues found
User Interface : 0.5 - User interface is average. Font sizes and table views need some improvements.
Performance : 0.5 - Scope is limited and not optimized for iPad