I've read the Gh2 book and the GH3 book, and very much look forward to the GH4 book, but I think you're missing an opportunity here. While I find the equipment lists useful, your tripod choice etc, I find myself referring back to the exercises in the GH2 book. I think you need to put out a digital cinematography book that's hardware agnostic. I think everyone should read the 5 C's of cinematography, and that's hard to compete with, but your book should be more about being on the ground, and how to make the best of what you've got. I think the reason I come to your site is the opinions, but it's also to watch you grow as a cinematographer, and hope some of that experience rubs off on me. The best way for that to happen is with a book about technique in this modern age.