For an author to to shoehorn a comprehensive Latin course for the independent learner into 400 pages is a challenge, as there is insufficient space to include enough practice material. The choice is therefore between writing a book for the complete beginner that proceeds at a fairly leisurely pace but omits detail or a more condensed but comprehensive book. Betts has chosen the latter option, so the book is fairly dense and a lot of new information is presented in each chapter. After the first few chapters, all the exercises are original Latin and are quite difficult. Exposing the student to original Latin as early as possible may be appropriate in a classroom situation where the teacher is present to encourage and explain, but the difficulty of the exercises means that the independent learner starting from scratch is likely to give up after a few chapters. The total beginner would be advised to look elsewhere. For a shorter introduction Sharpley's Teach Yourself Beginner's Latin is recommended, or for a more comprehensive introduction Wheelock's Latin with its accompanying Workbook (together with the answer keys for both, available from the publisher) and Grote's Comprehensive Guide to Wheelock, occupying a total of around 1500 pages and therefore providing sufficient practice material.
On the other hand, for someone who has already learned the basics of Latin, Bett's book provides a good revision course. As well as all the basic material, Betts explains some grammatical concepts in a slightly different way, introduces a few grammatical concepts not covered by Wheelock, and brings together some material that is rather dispersed in Wheelock.
Answers to all the exercises are given in the back of the book, but even for someone who has already worked their way through Wheelock, they are not easy.
The book is densely written, but the explanations and examples are clear. This book is therefore recommended for the more advanced independent learner who is determined to master Latin. Complete beginners are advised to look elsewhere.