I don't tend to like such an abrasive style-I find it turns me away, however I do know Harley's work to some extent and like yourself, look for those nuggets of information that strike a chord and make sense. I try to keep an open mind as far as possible. I try to do the same with all the books I read on infidelity by the 'experts'. Some things make sense, others just seem plain strange, whilst once I got so mad at something I was reading I threw the book at the wall!!!!!
I believe Spring in After the Affair at one point said that the LBS was equially responsible for the affair happening... THAT I found offensive, but I still reccomend her book.
I dont' agree with everyting Harley says, and I have argued with Penny Tuppy via email multiple times as well, BUT I still reccomend their work, its some of the best out there.. and to my mind the most important tools to have when an addictive affair is happening, I found MWD's DR to be far less uselful during the affair.