Well I passed:
A passing score for this exam is 80%
Your Score: Passed 85.2%
Below, you will find a detailed explanation of your test results organized by the exam question categories.
Introduction to Microsoft adCenter 93.5%
Getting Started 94%
Targeting 76.67%
Tracking Ad Performance 90%
Optimizing Ad Performance 80%
adCenter Budgeting and Billing 70%
I don't think there are any benefits other than the logo. Their directory is broken too.
Unless they will approve it and alter something to my account, it all seems normal!! Waste of money if you ask me.