sjm,
Guess no one else has used the DVDs, but I certainly have considered buying them. If you read Doug's review, he states, and I agree, that "Reading a book is no match for watching over an expert's shoulder while they work." I bought Ms. Eismann's first book on Retouching, and it is excellent. Do you or a friend own it, or does your library have it? If you have not yet read her book, I would NOT buy the DVDs -- unless you don't have to worry about the money

. First see how you like her teaching style and methods in the book, and then if you want more -- go for the discs.
I am NOT sure how much more she can explain in the disc that she doesn't share in her book, but I want to see her in action, and think that I would learn something from the opportunity. If I had a bunch of extra money, I would have already bought one or all of them, but I will probably treat myself to one for Christmas.
Ms. Eismann is highly skilled, writes clearly and well, openly shares her knowledge in her books and on her website -- you can't go wrong if you buy the DVD's -- it's just a matter of the expense and your budget.