I passed the CISSP-ISSMP exam on 12/22. I did not study a lot for the exam, I used my experience in the field to pass. I work in Security Management and Architecture. I referenced the bibliography of the Official Guide to the CISSP-ISSMP CBK 1st edition for areas that I needed to brush up on.
I had a few curve balls thrown at me and had to use the process of elimination, and my experience to select the most suitable answer.
So why did I decide to do the ISSMP when I already have the CISM? Two reasons, firstly pride. It had been on my to-do list for years now and frankly I got fed up of seeing it as uncompleted. Yes I know I could have simply removed it from my list, but like I said, pride

! Secondly I had a bit of time to kill between projects.