I tried using this book a couple of years ago (with my counselor). I was majorly retraumatized...maybe because I wasn't ready, maybe because the modality is more exposure-based...anyway, it wasn't for me.
I was also on a forum with women who were using the book (I think the forum has actually moved to Facebook). Turns out the author had relinquished his Social Worker license due to having dual relationships with clients. His wife called out (by name) the former client who had reported him to the board and totally ripped into her - including posting personal information about this woman's history and diagnosis (things she should not have even known, let alone posted). While that post was subsequently deleted (or locked down - not sure which), it was very disturbing, to say the least.
Anyway - for both of these reasons, I'd advise proceeding with caution.