I just did a quick search for it and it seems that customers were not very impressed. You can probably get all the information you need from this forum or elsewhere, for free.
I read some of it but I did not have to pay for it as it was part of my undergrad library online journal collection. At the time I thought it was decent, particularly about writing the personal statement. But that was like a year ago before I knew about SDN. By no means does it compare to the endless info on here.