Visual Quickstart is a great book teaching you about all the functions in Kai's power in probably less than two hours. I finished this book in a breeze and it provided me with all the information needed to know Kai's power tools which is complicated, but once finishing the book, you will have a familiar understanding about KPT3. cheap way of learning things fast. The reason I have presented a 4 stars rating is that I haven't review other books and don't yet know if it is the best but it can certainly be the best. Buy it.