Did you notice a difference in your reading speed after you implemented the techniques mentioned in the book? I have just bought the book. It is one of the first books i am reading from Josh's reading list.
I just bought the book too and finished up day 4. I've already noticed a nice improvement in speed. So far, it's mostly due to being very mindful of what I'm reading and widening my visual span. With some diligent practice and application of the tools included in the book, it wouldn't be far fetched to say that I'll see a 400% improvement.