I have the Ptolus book ( I didnt preorder it unfortunately, I somehow didnt hear about it till about right after it was too late to preorder ) and have read all the way through it.
I like it very much, I'm about to start two campaigns set it in soon. The only problem with it I have is that its a bit daunting to try and absorb all this material such that I'll be able to run a game, but trankfully it has some basic 1-4th lvl adventures in it that will help me get my feet wet. Its better than any WotC book I've got by far(disclaimer: i dont have an eberron stuff). I think I noticed, less than ten typos in the whole book,a and even those were some minor things, like a comma instead of a period. The sidebar indexing is awesome for figuring out just who the heck this person is, or what this item is, etc.
And I wouldnt classify it as an urban campaign with a little dungeoning, there's plenty underneath the city to only bother coming up to bathe and sell loot(and even then you dont have to come up to the full surface), although whats underneath isnt as detailed, any mildly creative DM could crank out plenty of dungeoncrawling adventures. And you could also just ignore whatever under the city and do everything up top, I like that it has that easy to change from urban RP'ing to dungeon bash-some-skulls and back again.
And certainly you dont have to read the whole thing to run a game, since its got details about the top of the spire and stuff like that that you wont send characters to till they're much higher level.
( Double Disclaimer, this is my first monte product so no fanboy ravings to be found )