Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't waste your money!

When you cut right down to it this book is just a 120 page commercial for the SINGMIN PCB. Andrew Singmin uses this book to continuously tell the reader that they'll have more success with electronics if they buy his PCB. The theory included in the book is non-existant, and the projects are simply a step by step guide of what to solder pin x of a 555 IC to. There is no discusion as to why. If you buy this book and build the projects, you will not have gained anything useful.