Well I've only spent a week with him...and he does FF, just not the traditional Carr way. I didn't go to great depth because you were talking AA type dogs. His claim to fame is centered more on early training, which is different from the other main out-of-the-box programs. Once you get to transition work, there isn't quite a HUGE difference. THere are still some. Bill is a cool guy and Mary is fantastic. You guys had a great opportunity by hosting them for a seminar. I HIGHLY recomend his seminars.