Yesterday with an 850.
My goal was to pass this by March 1st to meet the MS partner competency requirements and I originally scheduled the exam for 2/19 to give me time to use a Second Shot just in case.  I had to move up the date for a client commitment and I am glad I did not waste another two weeks studying.  My goal on an MS exam is an 850 and I hit that with little effort in the exam room.
I started off using the MS Press 652 Training Kit since it also has sections on SCVMM, but my primary resource was the Mastering SCVMM book from Sybex.  I skipped a couple of chapters that didn't match up to the exam objectives and then used 
my resource guide here as a review.
After taking the exam I can understand why 403 is not arequirement for the MCITP: Virtualization Administrator certification.  There is just not enough material to test in depth, and the designers seemed to be stretching to write enough questions for this very short exam.  I spent less than 30 minutes on the actual exam.  I maxed out the Deploying and Migrating VMs section while my weakest area was the Administering SCVMM section, something that should improve with more experience.  Virtualization is not my primary skillset, but I believe you need to understand the technology since almost everything you will be working on will be virtualized.  If I can make a few bucks doing some Hyper-V assessments or migrations along the way, even better.