Well I took the 640-822 and failed with a 714 and needed a 804. My problem was I ran out of time. I had 8 or 10 questions left to answer. I felt good about the test and thought I was doing really well until I ran out of time.
This was my first test with Cisco and I have to say I think the test really tests your knowledge to see if you know the material. My problem was figuring out how to get through some of the type of questions. I did watch the demo at the beginning but it's a little different when you have to actually do it. At least I now know what to expect and hope to ace my next attempt and will speed through it faster next time.
Good luck to all that take their next exams.