It seems like such an obvious good idea.
It's a wonderful glimpse into the creative process.
Just received it last night, and I'm already half through it. I haven't done that since I was eleven and got Stan Lee's How to Draw Comics the Marvel Way. Not that this book has any similarity to that one. This is not a how to book. Its a more intimate, than any instructional book. Its a similar difference in experience to watching a biography to reading someones private correspondence. The presentation adds to the feeling as well.
Better than seeing pencils, better than watching a demo, or hearing someone try to explain the creative process. You actually see it and are part of it because this is what the artist sees, while he is in the process.
As a comic book fan for years and creative hopeful (which I believe is a large part of the intended audience), I hope this is first in a long line.
Great job, thanks Mr. Gertler.