I just finished the book in about 24 hours, and have to say that OT was even better than Watching the Clock, which is quite an accomplishment given how excellent WtC is.
I'm much less familiar with and invested in the original Star Trek than I am in its successor spinoff series, but the book went a long way towards giving me a greater appreciation for the series and its characters and setting in much the same way that Star Trek Vanguard did.
One of the things I enjoyed most about Watching the Clock is/was the DTI itself and the characters who work for it, and this book continued to expand on them and the organization in surprising and interesting ways.
I also really enjoyed the book's depiction and use of alternate timelines, something that I personally think is one of Christopher's greatest strengths as a writer and storyteller. I think my favorite AU character was T'Pring; I especially liked that she and Spock actually participated in ponn far togethet, especially since it added some interesting new layers to Spock's character.
Even with only two books released, DTI has quicky established itself as one of my favorite Trek Lit series and I would absolutely love for it to continue, even if Christopher doesn't write any more installments.
I'm giving the book an Excellent rating, and, as noted, really hope that more DTI books are greenlit by the editors at Pocket.
