Its been 2 weeks since I go the course so here is a bit of an update that I hope will be useful for someone:
I have finished the first 8 CDs and I have started the 30 day challenge (14 questions in days 15). I cant say that I notice huge differences in my thinking or abilities. There are lots of small things that I am noticing different though. I still recommend the course highly.
I have started listening to the Accelerator CDs now and my opinion on them has improved somewhat - there is lots of good information content there. I do find that they require a lot of concentration and effort - in the form of taking notes and mindmaps as they are not very structured and listening to them n the car didnt give me much.
In a month or so I will post another review, once I have finished the whole course and repeated the basic course.