Took the CISSP today and need to share my experience.
Background: Ive worked for a large global corporation (over 30000 global employees) for over 10 years as a Window System Admin and IT Security Professional. So - I have plenty of experience in a large enterprise organization... For reference...I took this exam with over a dozen individuals from my company. I was definitely very prepared....
Material for Study:
Harris - AIO 5th edition. Went through 3 times.
ISC OIG v2 - Went through twice
ISC Review Seminar (company paid)
ISC Student Handbook from Seminar - went through twice
4000+ Review Questions from AIO, OIG, cccure.org, and other random sites
a few NIST documents
Got to the point where most of this stuff was committed to memory... Close to 200 hours of study including the seminar. Done all over 2 1/2 months. I'll let you do the math - but it was pretty intense study. Took a practice test of 125 questions the week before in the seminar from retired questions and got 80%. Went through it quick - and thought the results were ok. Spent the entire 6 days before the exam 10 hours a day cramming for this thing...
And the test... was... brutal.

I did the best I could possible to prepare for this thing...and these questions are intense! Anyone who says this is 1" deep is crazy.

Some of the detail of these questions is unbelievable... I received a few questions and terms for things I had never seen. You'd think with the ISC guide and an instructor from ISC - you'd see it before the exam...hopefully just research questions.
Its tough to go in to detail right now of what was covered and what wasn't. I'll go in to more detail if anyone asks... Nothing specific obviously... but at least area wide. A couple of things like Legal - barely there. Cryptography - know the major algorithms and what they are best for...that kind of thing. I received very few - 'definition' questions. A couple of times I got on a roll with 7-10 questions and was super relieved... A couple questions I would stare at for 2-3 minutes trying to determine exactly what was being asked.
Took me 4 hours and 10 minutes...didn't go back through, because I made very sure I rationalized the question and answer the first time through. Was very close to being tricked and tripped up the first time through though on some of the questions. READ ALL THE ANSWERS!!!
Overall - I left feeling good. I will be surprised if I don't pass... but this was extremely brutal and not passing is very possible.

Advice for taking the CISSP.
Either the ISC OIG or AIO v5 will work for you. I preferred Shon Harris AIO... yes its longer and yes the humor is extremely annoying... but it is an easier read and I understood the material better, more examples on applying the material as well. The ISC OIG v2 is good, more to the point... but I would go AIO v5 and get the boxed set - close to 2000 questions...
Advice on Practice Exams
Memorizing some of this stuff is beneficial... you will obviously not get identical questions on the exam...that isn't the point. But you have to know how to apply this stuff and repetitively committing it to memory does help. I paid $40 for cccure questions... about 2000 of them. Not sure if it was worth the money... although I can say it may have gotten me 1 or 2 on the exam. The Shon Harris questions from the boxed set were just as helpful.
Advice on the test itself
I committed a page of material to memory and wrote it down when the test started. OSI/TCP layer and the apps - all the crypto algorithms - the steps for bia, incident handling, cmm, tcsec, common critera, sdlc, private ip's, and ip ranges. It was a lot of material. Like I said, I had all this committed to memory in detail... I needed it once. Got 3 questions on osi/tcp layer I think.
From the 250 questions... I remembered maybe 10 to come home and look up!!!
70% of the exam is thinking from the Mgmt Level - 30% are technical answers. It is tough to think from a high level when you are under pressure, stressed, and are trying to drill down to find a correct answer. Take a deep breath and examine
WHAT specifically the question is asking. There could be 2 answers that could work... one answer could reference a solution for availability and another address an integrity answer... If the question asks about data consistency... the integrity answer should be correct. Keep the AIC triad in mind when looking at questions and answers... No way this thing is 1" deep however... I received quite a few detailed questions where you would have to know the technology etc... in depth to be able to rationalize a correct answer.
By far the most intense test I have ever taken...
Any questions - ask. Ill give you as much information as
ethically possible.