I got the Castle Whiterock boxed adventure and City of Brass at GenCon. I am very, very happy with these purchases!
With Whiterocks totaling over 700 pages, and City of Brass 450, I did not get a chance to read both so far!
I can tell you City Of Brass comes in a sturdy, solid box. They fill it right to the rim, there is NO space between the stuff inside and the lid - it is PACKED. I read the intro and theory behind it's design and looked through the various books within. It seems like an awesome tool for DMs running epic games or soon-to-be epic games. Loaded with story potential and an entire book of stat blocks ready to steal.
The Castle Whiterock box has to be the biggest RPG boxed set ever. There are different books, each divvyin up various levels of the adventure (15, plus sub-levels and side quests). There are full-color poster maps, pregenerated characters, a book of handouts, a full campaign gazeteer, and more. It's loaded. Something I thought was a very thoughtful touch: they included an index book that lists every name, thing or palce in the entuire campaign, gives a one-liner to refresh the DM's memory, then attributes pages where it appears.
While I am at work now, I can look into them tonight if anyone has specific questions.