Well, I've finished the novel, now I can leave my thoughts (I'm a fast reader):
Whew, that was definitely a fast ride I won't soon forget. I think it may be the best of the Typhon Pact series (based on the ones I'd read). I liked how DRGIII integrated all of the members of the pact, and also used characters from both TNG and DS9. That Romulan Betrayal was a good addition as well.
As for the ending, was I the only one who felt gut-punched reading the final line? (No, I'm not posting it here. Read it yourself!)