I'm not sure whether its in the "beast" category but its certainly a bit of an animal
Having failed twice recently with a "550" I got a 650 today

Just about two questions off I reckon. A big improvement but not quite good enough.
Exam was pretty staighforward (40 questions) but had about five very ambiguous questions that could have gone either way.
I may well have second-guessed a couple to my peril at final review but took the view that I did not know those particular questions anyway so took pot-luck.
I targeted three exam objectives which were weak last time only to find the other two turned out to be weakest on this exam.
I found The Sybex 70-646 and CBT nuggets to be a big help but the multi-scenario ambiguous questions foxed me on this occasion. I'm planning a re-match in 6 weeks time.
Back to the drawing board (again)........................