Normally I am over in the CCNP forum, but I guess it is more appropriate to post over here.
Passed the IIUC exam today, adding another acronym to the resume

Exam was fairly straight forward, not a cake walk, but easier than those CCNP exams. There was one question on call-legs I know I got wrong simply because of how they formatted the question and answer. Not to go into too much detail, but it was a picture diagram with drag and drop that made absolutely no sense how they wanted you to lay out the answer.
Anyway I read through Jermey's cert guide a couple times and spent a fair amount of time playing around on a UC520. The book will do you well for the exam, just make sure not to over look the section on the GUI.