I'm with KM and rachylou. I find it mildly entertaining, like astrology, but actually give it a little less credence than color analysis, based on what I've read. Every time I've tried one of the quizzes, I get frustrated at the level of analysis, and I'm saying that as a person who is highly analytical in many aspects of my life!
But I get the feeling that you can take this stuff so far and end up being in a category of one. Yes, I am Janet-shaped, and that's the final analysis. But I am not just a shape or an assortment of lines, planes, and features. All of the Kibbe stuff I have seen focuses on the visual and ignores personality and preferences (I understand that perhaps the book takes this more into account, but I have not seen that in the threads). So yeah, what if I'm supposed to be some sort of Romantic (which seemed to be one of the more apt categories for me) and that means I should be dressing in flounces and ruffles and details? That's just. not. me. I dunno, I just can't get into that, when I've done it before at other times in my life and it has made me feel unfab. My style is getting simpler lately, and I'm happier for it. I tend to be much more instinctive and emotional about my dressing, despite my analytical side (although I am an INFP).
My final analysis is in my mirror, my heart, and my gut.