I backed this on Kickstarter, as I am a fan of the Sly Flourish blog and the original Lazy Dungeon Master. While the concept of the Lazy DM has not changed, Mike Shea has done a great job expanding on his original ideas, and this newest publication seems to work very well with 5e (though most of his advice is system agnostic).
The checklist and methods described are a very good investment of time for those of us who love running D&D, but also have other time commitments. With well under an hour of prep and some practice, you can be ready to DM a four-hour session.
As a bonus, the art in this book is amazing!