This book does cover some subjects that are hard to find in any other book; including recent broadcast standards like J.83b and DVB-S2. So I imagine some people will forced to buy it in desperation, thus justifying its high price. Sadly however I have to say that it is very badly written. My guess it that the author doesn't have English as a first language. There are no spelling or grammar errors: these have presumably been weeded out by a process of spell-checking / proof reading. What's left, however, is almost gobbledygook in places. Very waffly, lots of repetition, concepts very poorly explained. I still hold out hope that there might be nuggets of useful information in here, but I'm finding the book frustrating to read.