What is the pass/fail rate of the Master Leader Course (MLC)?

With the intensity of the MLC course and the highly structured writing involvement, are there any statistics out there on how many actually fail the course? I hear horror stories on the grading, but I never heard anyone actually failing the course (unless they intentionally failed to meet a standard).

For those that have taken the course, what are your key take aways you wish you knew before walking in?
Do they provide enough detail and instruction to set you up for success?
How difficult did you find the Research Paper, SAE, EXSUM requirements?
Lastly, has anyone used the Grammarly program to assist in fine tuning their writing?