Been listening to the second Cd and I find it even more informative than the first one. Its really nice to hear Williams explanations and views on things instead of always reading about it. He talks about many things I have never heard of on CD 3 to.
I recently tried the spiral method which basically is a visualization method in where you imagine a lake in which you eventually float and it then beginns to turn in a spiral to build up a whirlpool. This technique gave me really strong sensations of gravity and floating etc. And I actually found the visualisations to be very easy to maintain with Williams guidance. Easier than I'v ever felt before.
So far its been only positive experiences for me.