Saw that one too, I heard that Esther's book is the most detailed of the bunch, I like that aspect.
I thought it was interesting about her views on the L5-S1 curve being prominent and the lumbo-thoracic area and thoracic kyphotic curve being relatively flat.
Every chiro or bodyworker I see tells me I have a hyperlordosis (which I believe is exaggerated from what they are used to seeing, due to muscular glutes and back) and a flattened thoracic spine. After seeing this stuff, I'm tending to believe that what I've been doing has been working!
Oh yeah, my back muscles on the outsides (under the ribs) are decently sore today from all the "inner corset" work I was doing yesterday....