OK first of all, since your hostility seems to be directed at me and the other two that are active CFI's...back off. Sorry, I've been tied up doing my job most of the day (and I imagine they have too), which happens to take priority over justifying why I think some crappy book is a piece of crap.
But, to be fair I dusted it off and opened it up for the first time since I got it (a year or so ago). I guess it isn't bad to use as a guide when making your lesson plans...so as you don't forget anything.
Personally, the reason I don't like it...
I make my lesson plans so that my notes are included. That way when I'm standing in the briefing room giving a pre-brief or a ground school, and I forget something (yeah, I know...god forbid), I can simply look down and remember. No bluffing, and no looking like a dumbass in front of the student when I have to say, "uh, hang on, let me check on that." I'm not saying theres one single thing wrong whatsoever with admitting you don't know and looking it up, I just don't like to put myself in that position.
I like to have everything handy in one place- in fact, I'm almost to the point where I can train somebody for their entire instrument rating (or CFII) without ever using another book besides my Instrument binder. Its got everything: a custom syllabus (loosely based on FSI's, but modified for part 61), lesson plans/notes to correspond with the syllabuses (syllabi?), IA/CFII PTS, Jepp Airway Manual intro. section, and of course, printouts of MikeD's IFR quizzes and tech tips!
The only other thing I have to carry to an IFR brief besides that is my FAR/AIM and my flight bag.