I have been on one of Leigh’s retreats, and I got to read through an early draft of this book in 2013; I can highly recommend both. His approach to the jhanas is based primarily on the early suttas (in contrast to later traditions), and aims at making a realistic beginning that can be deepened with time and practice. Like his teacher Ayya Khema, he is relentless in framing the experience of the jhanas as a support for insight.
Wisdom distilled from helping thousands of students find and navigate these mindstates combines with a clear and nuanced reading of the relevant sutta texts.
You can learn some about Leigh Brasington’s approach from his website http://leighb.com/ or from Richard Shankman’s interview with him in The Experience of Samadhi. But this book is richer than both together.