Finished reading this morning. I enjoyed most of the essays. Unlike some other recent unauthorized Star Trek nonfiction titles, there seemed to be very little speculation presented as fact in this volume. I only arched an eyebrow a couple of times, and both times I realized I'd misconstrued what I was reading.
If I can get through an entire Trek nonfiction book without bumping up against something I know to be incorrect, I'm impressed. (That's not to say there are no misstatements in the book, just that they didn't misstate anything I knew to be otherwise.)
Good work to all the contributors!