Yes it's profitable for DSLR users too, chapter 21 is dedicated to one-shot color, it explain where processes are the same or diverge between color CCD/DSLR images and monochrome images.
Take a look to these links http://www.springer.com/us/book/9783319256801 and Jim Morse review, http://cs.astronomy.com/asy/b/astronomy/archive/2016/09/28/a-review-of-the-book-inside-pixinsight-by-warren-keller.aspx
I like very much this book It's suitable for all levels with a lot of information about PI processes and scripts.
It's a complementary tool to the existing tutorials.
IMHO you'll learn PI more deeply and quickly using this book.