I bought this book to try and learn Swahili more as a hobby than anything else and found it to be very useful. It is easy to follow and has exercises at the end of the chapters to help you see if you have understood the material covered. The only small thing I would point out is that the vocabulary in the converstions is often not included in the vocabulary boxes until the end, so it would perhaps help to read the vocabulary boxes first before attempting the conversations as you may feel a bit lost otherwise. If you seriously need to learn Swahili, I would think you would be better off using the tape as well, as it is difficult to learn pronuniation from a book. And the obvious disadvantage to learning a language from a book is that you might teach yourself bad habits. However I think this is unavoidable in teaching yourself a language. If you don't already speak more than one language and aren't used to learning another one, the book might seem daunting at first, but I think with perseverence it would provide a very reasonable basis to learning a language if nothing else.