I finished this a couple nights ago and I enjoyed it. The whole non-linear timeline got confusing at times, there were a couple sections where there was a scene change and it seemed to come out of nowhere, but I've been dealing with time travel in Trek since I was four so I could sort it out eventually. I liked the characterizations of everyone except for Vale. The talk about her mom and her getting too involved in Riker and Troi's problems just seemed off, though I did like the little blue councilor we met. That's probably the best part of the book, the second stringers got the spotlight in this one.
I do hope there's some way we can see Jaza again. I liked his story arc in this one and in the series as a whole, the religious minded scientist is an interesting idea that I think shows people that both can exist side by side without trying to kill each other.