I've followed everyone's sitch on this board the past two years, thru PM, SSM and other "flavors of the day." As I've posted repeatedly, I don't personally a lot of long-term success stories here. They ONLY seem to work when BOTH spouses agree there is a problem, BOTH are willing to work at it -- persistently -- and even then, they are RARE.
Most of the "help" from these books, to me, seems to be along the lines of "Well, you won't get any more sex (or even affection an intimacy), but we'll give you some tips and techniques for feeling better about your (sex-starved/celibate) self in the process."
GAL, differentiation, 180s . . . call them what you will, but most of the advice centers around doing what's best for YOURSELF , which, of course, isn't a bad thing.
It's just not going to lead to any lasting changes in the LM department of your average marriage.
Sorry to be so negative, but that's just been my observation.