I have just downloaded the introductory unit and accompanying teachers manual. I am completely conflicted as I read through. On the one hand I am going to sit down and do the introductory unit with DD1 as I think it is exactly what she needs right now. On the other all the references to not letting the faster kids get ahead, keeping the faster kids busy while you work with the delayed kids, etc just brought all the frustration of being that bored faster kid flooding back.
And I do wonder how well a system like this would work for a "big picture" learner. What about the kids that won't "get it" until they understand the why/how of the big picture?
My DH, and his business partner, were my bosses straight out of school and the two of them were probably amongst the best teachers I have ever had. Both of them would always start out explaining something to you with the assumption that you had all the background knowledge you needed and the smarts to "get it" from a quick outline of the big picture - which was usually the case. But if that wasn't enough they were always quick to break it down a little, and a little more, and a little more, until you really did get it - always with equal respect and enthusiasm as they started out with (in fact often getting more excited as they really warmed up to talking about an idea, both of them loved nothing more than a good white board session).
So I think I want to try this with my DD but I am not sure I would want her school to try it. And that seems crazy!