I'm someone with no IT work experience who just passed 70-98 as my very first MCP exam.
As I prepared for the test, I had serious doubts as to whether this product would give me an accurate preview of what the real test would be like.
I was very pleasantly surprised to find that I was extremely well prepared! Unless you have TONS of experience networking Windows 98, you should really consider this package, particularly for the price! I found the questions to be as difficult, if not MORE difficult then most of the real exam questions. I'll put it this way - I didn't pass this Readiness Review test until the DAY BEFORE my real test!
However, you should obviously not rely on just this. I also used the Sybex and Syngress/Osbourne study guides, with the MS Windows 98 training kit for reference, and then the Exam Cram to finish up.
If you want more info, read the reviews for the "Networking Essentials" Readiness Review - I feel those comments apply here as well, and I just bought that one for test #2!