As much as I appreciate the research efforts that went into On the Edge, the final product suffered from the lack of oversight of a professional publisher - typos, spelling errors, and other inconsistencies. These problems seemed amplified in the second edition, so much so that I haven't been able to get through it.
So I'm looking forward to the polish that MIT can bring to an Amiga book... and I've just preordered it.
That being said, I hope that On the Edge (and its upcoming Amiga-focused follow-up) get picked up by a professional publisher for a third edition. The world needs more memories of the Amiga.