I am not depending on a book like this, however working in this field and wanting to keep on top of the trends etc. you do need to buy books constantly or you would become stale very fast. Reference books have always and will always be welcome in my library for as long as I will be working. I think the reason why the book doesnt work me me, is I`ve been doing this for so long that I have my basics down, and dont see them in ratios, but rather grams and ounces, so when I tried to do some figuring out I wasnt coming up with the right amounts. This is not a personal attack of the book, but rather a personal opinion.