Loved it. Easily my favorite since before the whole Typhon Pact started. Finally Geordi got the development he needed and I think it's perfect where he ended up.
First book in a long time that wasn't steeped in politics and such, although there was some. Loved the cool sci-fi ideas on display.
If I had to pick, I would complain that some of the Challenger's crew were fairly underdeveloped, such as Carolan, and that the Tal Shiar Chairman's characterization seemed a little...off. Too soft.
Otherwise, best Star Trek book in a long time and I recommend.