Still haven't finished it; will update my review when I do. As it stands now, it's already one of the most influential and significant books I've read.
It pains me to know that John Yates was recently involved in a case of misconduct; I cannot help but fearing this somehow taints his work. But my rational mind tells me that the teacher is not the same as his teachings -- and, of course, of all these teachings only some are truly his.
If I may: the fact that someone could write this book and then also fall to ethical/moral misconduct also teaches the fact that attaining insight and calmness is not enough; one has to keep them, and use them with intention as tools to foster virtue.