The book is clear, concise and correct. Warren is an expert in bankruptcy law and, unlike many others who write on personal finance, she bases her advice on both expertise and research data. And she writes well, too.
The book avoids gimmicks and offers realistic ideas for both emergency situations (chapter on Financial CPR) and for a lifetime (the 50-30-20 budget.)
The energy meter answered my question. It showed that I own one device which it really does make a difference to unplug when not in use.