— Matz, creator of the Ruby language
The amazing review / testimonial the author probably was able to ask for because he's credible and an active member of the Ruby ecosystem (tinyrb).
Another lesson on the value of real working relationships.
Also, I'd like to read the book, but not for the price the author is asking.
I'm impressed that one can sell an e-book for near $1/page, though. I realize that, in the end, it's about value delivered, not page count, but still.
It tells me that people are not as price sensitive to some things as I thought.
And a better deal.
Taking advantage of "This is a not a dead tree" is sorely lacking in the E-books I see. Even the page layouts of E-books assume you're using some shaped-like-a-page viewer, rather than allowing for a flexible layout that works well across different screens and devices.
I'm glad the site links to the source, though. I like easy to verify testimonials.