Yes, I have only really studied Tibetan, or Vajrayana mostly, and it is a bit mystic. I have always been drawn to the Dalai Lama's open mindedness in regards to science and how when an ancient Tibetan tradition is proven wrong via scientific evidence, he seems to always be accepting of the change and understanding that some tradition is just that, tradition.
A lot of TNH's writing don't resonate with me, although like you said, he has to be commended for reaching the masses which isn't something a lot of Buddhist monk has been able to do in the past.
I'm very interested in learning more about Theravada Buddhism and so I'll search for that book. I'm sure I can snag a copy somewhere.
BTW, how is Panflute doing? I feel like I haven't spoken with him in ages.