Robb Barrett, my best advice there is:
I took the pre-test and got 90+ on it. Then I took the exam at the conference and failed.
Not that the MCE is useless, but it's $175 to put a company's logo on my LinkedIn page. It seems like it's more of a benefit to Marketo to have people with the badge than it is to actually have the badge, but I may be wrong. I just didn't see any tangible benefits to my company for having the badge on my LinkedIn page.
If you are referring to the Summit this past April, all MCE exam takers were offered a free retake by a certain period.
The exam preparation materials were not up to snuff as admitted by Marketo, so they revamped the materials here: http://learnadmin.marketo.com/ContentDetails.aspx?id=83BE4E182F3A423FABC045F276F4137D
Yeah, I was in contact with someone about it but it was a long time between replies from her and finally I just gave up. It was embarassing enough to have to go back to my boss and tell her she spent $175 for me to fail and try to explain how pointless the questions were.
I'm bitter. I had a really bad experience as a result of the Summit exam and I absolutely see no value in the Cert other than helping Marketo get it's logo out in more places. Relevant work experience trumps a certification based on memorization of trivial points of the program.