Dotpoint is more of a summary book where you answer questions derived from the syllabus. The quality of the book depends on how efficiently you utilise it, whether you answer the questions with reference to other sources before consulting the answers as opposed to relying on the answers at the back. That being said, some answers at the back are lacking in detail, while others are pretty good
.
The book itself is also pretty costly if you buy it from bookstores, such as Dymocks
, about $45 if I remember correctly. Some schools supply them to their students for $20-25 though.