I felt reasonably confident leaving the exam. However, I wasn't sure if those feelings were just from being relieved that it's over with or really genuine. I know that I felt much better than I did after the two [horror show] Practice Exams that I took.
Of course, similar to others, as each day passed my self-doubt began to set in. To make it worse, I could barely remember any of the problems when I attempted to sit down and analytically figure out my chances!
Overall, I think (as the poll numbers are showing) that your gut feeling about the exam immediately after completion is worth something.