The first two modules cover the definition and scope big data and big data systems architecture at a high-level and in a platform-agnostic way. I appreciate the platform agnosticism. The modules take a few hours to go through before being ready for the exam. I found that if I read through the workbook twice, I was more than adequately prepared for the exam and was able to pass them both with honors. Also, the included CDs seem pretty useless unless you are a particularly aural learner. I found the tone of the speaker to be dull and uninteresting. The books that come with the modules seem interesting -- I only read half of the first one and haven't started the second one. They are not necessary for the exam however.
I plan to continue with modules 4-6 until I earn my Big Data Scientist certification.