I had the chance to browse through this book while eating breakfast this morning (my wife has one of the Kindle unlimited accounts that let you read many of the ebooks for free). Here are my impressions:
The book is heavily oriented towards ham radio use of SDRs, vs SWL/DXing use. A lot of the text specific to actual SDRs is devoted to Flex, Apache, etc. There's brief mentions of the SDRPlay, RF Space and AFEDRI radios, by comparison. Likewise there's some very in depth discussions of a few SDR programs (probably ones the author has experience using) with lots of screenshots, but no mentions at all of SpectraVue, SdrDx, etc.
There are some good discussions of the basics of SDRs, signal processing, digital vs analog, etc. If you have no experience at all using SDRs, it could be a good read. If you have been using an SDR already, I am not sure you will learn much.
The author did wade into the knob debate, and pointed out some hardware knob options for SDR applications. That alone might be worth it for Fansome to get a copy.