In a nutshell, this book is causing me issues! It is, for me, an interesting rethink of the way that I approach editing an image. That you take some steps in the workflow which temporarily degrade image quality does not necessarily make it any easier.
The PPW as taught by Dan Margulis, offers an interesting Photoshop plugin, plus training through a book that he released this year, Modern Photoshop Color Workflow. Although I am still slogging through the book, at the outset it seems like some of the tools are really effective and interesting, not to mention easily adjustable, but others require more discipline to get right. Still others are making me reconsider aspects of my RAW workflow.
In no particular order, I am really enjoying these modules:
1) Bigger hammer (how can you not like a tool by that name? )
2) Darken sky – does what it says; that's nice.
3) H-K – interesting, but I'm sure it will take some time to figure out what images it really improves
4) MMM (Modern Man from Mars) – brings out color variation
5) Color boost – sometimes the color hurts, other times it is merely out of gamut . Pro tip: wear sunglasses until your pointer is ready to yank down on the opacity slider.
A few of the tools make me feel like my existing RAW standby, LR4, is doing okay, especially at the low level pixel-integrity issues. However, the PPW can make some complicated and powerful tools so easy that it is addicting.
Dan does person-to-person training in Photoshop and it shows. His book is greatly helped by beta readers who kindly point out (at various points in the text) that normal humans will not necessarily understand how to do certain things. I think the most helpful part has been the video training through the website. I believe anyone can register through the link and see the resources for each chapter. Might be fun if you're having a slow day.
I think the hardest part for me in the PPW is the color-by-the-numbers initial adjustment to the image. I'm sure many users would probably say the same thing. In a workflow designed for speed, it sure is difficult for me to do this task quickly.