I'm not blindly giving this book 5 stars, or even because it was an enjoyable read (though it was). I'm giving this book 5 stars, because the concept works. Roughly a year & a half ago, I read an article discussing some of the concepts from the book. I decided to implement the mini-habit concept to starting to work out. I didn't do 1 push-up a day. I set my goal as 5 minutes of walking, every morning. Not going out for a walk, just.... Dragging my tired @$$ out of bed first thing, and as soon as I've gone pee, walking out to my living room, turning on some show I've got DVR'd and mindlessly walking for no less than 5 minutes. Just 1 year and 2 weeks later, this has been habit for quite some while. And I've lost 20 lbs. (Also included my own rough take on Alton Brown's 4-lists diet.) I give this book 5 stars, because I have EVIDENCE in my own life that it works. I also recommend it freely to those around me who've talked about difficulties getting started on healthy habits. And now that I've finally read the book, I'm putting in a request for my library to obtain a copy.
My next step is to begin a small handful of new habits: 1 pushup a day; 10 second wall-sit; a German word per day; and plugging my thumb drive in and opening up one of my novel-documents (for me, even writing 50 words seems intimidating, but I CAN open up the damn document).
So there you go. Not a 5-star based on just reading the book. A 5 star based on my own success with the concept. If you've got any habits you'd like to form, give it a try. And even if you think the idea's probably bullshit, read the book, give it a try. What have you got to lose, except the time it takes to do "one pushup."