My college level Pattern Alteration and Fitting class is using this book as a text. The instructor has allowed students to come in with the previous edition, and so it's easy to go back and forth to see what has been changed. For the good, the instructor has been making us do the alterations mapped out in the book on half scale paper models first, and the information on the pages has been letter perfect, not to mention the diagrams showing one where to cut, slash, and spread, or fold to adjust the pattern piece. Very, very helpful trying this info out on a mock-up first before attempting to do it in fiber.
Really, the issue that I have is that in older editions Judith Rasband was the sole author and included photographs of suggested ready to wear fashions for each type of figure "flaw/challenge." There aren't so many of these in the newest edition. Of course, the old edition screamed 80's fashion, so that probably has a lot to do with it, but there are young ladies in my class who are absolute beginners at sewing, and the diagrams in the book that only have arrows designating that the design emphasis should be higher, lower, in, or out on body parts in question makes absolutely no sense to those girls. It is a lot easier having a photo showing what real high-waisted trousers look like on a long waisted figure (for those who grew up wearing nothing but low-rise pants) or longer hemlines to cover up problem calves. I suppose that Liechty intended that cutting the majority of "fashion plates" out of the book would make it more utilitarian in the long run, but trust me when I say that there are people who have problems visualizing and need a lot of examples in photos to spell out multiple suggested solutions before it makes sense to them.
I have been doing basic sewing a very long time (as in don't deviate from the Butterick pattern), and so the other beef I have is how do I apply these alterations from the diagrams in this book, which appear to be copied from fitting shells, to fashion patterns? I would recommend "Fantastic Fit for Every Body" by Gale Grigg Hazen to help transfer the important fundamentals shown in this book to fashion pattern pieces on real bodies. The Hazen book has good reference photographs as well as drawings, and the two work well in tandem.
Fabulous Fit is a good piece of reference, but it's not for someone who just learned to sew recently. If you have a well-experienced sewing buddy who can help you with the info in this book, then go ahead and buy it with the intention of having your sewing buddy help you out.