I haven't taken the course. EnCE is a pretty good cert though. There are about 100 questions, I believe that are multiple choice. The main portion of the exam is an actual case. They send you a hard drive and you go to town on a somewhat realistic case. You have to produce a good report.
From what I have heard, it's probably not a good idea to take the exam right after the course if you haven't had Encase experience. From personal experience, Encase is a tool that's very counter-intuitive if you don't use it every day.