I'm curious about the CompTIA CertMaster Linux product. In my undergraduate courses, I often get questions like, "What's the best tool to use to prep for the certification exam?", or "Can you recommend a good 'test simulation' product?". One would logically reason that the "best" prep tool is the one offered by the certifying body responsible for the examination. That said, I didn't actually use the product when I obtained the Linux+ certification. Thus, I don't feel comfortable recommending the tool to my students based on my lack of first-hand knowledge.
Have you used the CertMaster product? If so, do you recommend CertMaster as a good prep tool? What did you like about CertMaster?