Although I do not own the books, I have had the chance to read them.
My impression was that many of the "best" effects in "Million Dollar Card Secrets" and "Super Subtle Card Miracles" are already in the Ammar ETMCM videos.
For example, let me point out that Garcia states in "Super Subtle Card Miracles" that the effect "Miracle Worker" is by far one of the strongest effects in this book. Well, "Miracle Worker" is an effect that is well explained on one of Ammar's ETMCM DVDs (although the effect is known under a different name).
So this brings me back to my initial question. What is so great in these books that I have not already encountered in some readily accessible source?
Sometimes, I feel the search for the "best" effects in card magic through the 100+ magic books that I own always bring me back to the Ammar ETMCM. Maybe I should stop searching for the mythical best effects and realize that what I'm looking for is in one of the first things that I acquired long ago.