I shoot professionally and spend quite a bit of time each day working on images in Lightroom. I try to stay up-to-date on all things Lightroom through forums, videos, websites, etc. Although much of the material was review for me, I found lots of really helpful little techniques and approaches that made the book a very worthwhile purchase. His personal notes are what I found to be the most helpful as he intersperses the main material with little hints and tricks to improve the work flow. There is a lot of great material in this book that will take some time to master. I'm going to take my copy to an office store and have it ring-bound so that I can refer to it on a regular basis. I highly recommend it for those who want to squeeze as much as they can out of Lightroom.