A fine conclusion to the trilogy, imo slightly better even than the previous books. Yes it does leave some cliffhangers for Aspect Emperor, a new duology of which the first book will come out in 2007, but that only heightened my anticipation.
I would agree with some complaints that the ending of some of the character isn't entirely satisfactory, though I wouldn't describe any of them as poorly done. Compared to the previous two books this one is rather short, but it does come with a superb dramatis personae/appendix of 100 pages, which will be handy reference for future books.
On the whole I'd say this book is on the level of the previous ones. The downsides are repetition in character introspection and a heavy emphasis on the philosophizing by some characters ( courtesy of the author's background). Others will find this appealing, I was more in it for the plot and characters.
What it does do is provide a tremendous set up for the next two book in which the grand overall arc of the Second Apocalypse will see The Consult come to a head with the Aspect Emperor and allies.