Just chiming in with my 2 cents on the KB Goddess...I just did it for the first time today and don't looove it, but don't dislike it either. I think I'm a bit spoiled by Cathe's superb cuing, so I expect all instuctors to do it the Cathe way. I would love to see what Cathe would do with a KB workout!
What's nice about the KB Goddess is all of the variations possible. Today, I did a full body rotation and felt like doing more, so tacked on a lower body and then threw in a few swings and pushups for good measure. Another thing that I like is that each segment is relatively short (or so I understand, since I haven't done them all yet). This is nice for me because I've been unmotivated lately and can mentally commit to a short session only - but once I get started, it feels good, I'm having fun and then I want to continue.
I'm now chomping at the bit to get something from AOS and a Lauren Brooks since I keep hearing such good things about them both here.
Oh, and as for the Iron Core Way with Sarah Lurie - I think I read something here from someone who was less than impressed, but I have to say that I purchased Volume 1 from Target and it helped get me over the fear of hurting myself. It's really basic, but I could go slowly and really concentrate on my form...I felt it the next day too. I felt like it was $15 well spent (a single KB class runs between $10 to $25 a session in my area).
Gosh I'm lovin' the KB's!!!