eh - to be honest - that kind of information is best when you experience it, not read a case study. Although that DVD might help you get there faster.
Most stuff about the internet is on the internet - for free.
With these "eBooks" and "DVDs" - 99.99% of the cases, What you buy is time - time you'd otherwise spend lurking in forums, reading articles etc. It comes down to how valuable your time is.