I really liked this book - The interactions & relationships (Chen-Taurik, Chen-Konya, Worf-Elfiki, Geordi-Harstad); the exploration of what happens when a race/races discovers alien tech known to the Federation; the world-building; the non-evil alien leaders/representatives; and the mystery (please, please, please let there be a Taurik/DTI follow-up very soon!). The characterisation was all top notch - I especially loved the mature, restrained Worf. Oh, and the appearance of Siouxsie from the 2011 Ships of the Line calendar was a treat!
A couple of things prevented me from rating this outstanding - I found there was a little too much explanation of past events. Some of it was necessary, but I got the impression that the rest was tacked on (at an editors request, maybe?). The general resolution was predictable-and there's nothing wrong with that-but I think it could have been more interesting if certain people had survived because technology hadn't crapped out just like it always seems to in these circumstances.
Over all, I think this is a fantastic novel, and would be a great picking up point for anyone new to Trek Lit that doesn't want to (or hasn't the time to) wade through years worth of previous storylines/arcs (Destiny, Typhon Pact, The Fall etc). Bravo Dayton Ward!