Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: Outdated 1DO-410 was retired, and replaced with IDO-510
Review: As far as I can there no CIW books that are much newer than 3 years old. Also, there are no books for the IDO-510. My guess is that after internet bubble burst, the demand for CIWs burst along with it.
