I don't know first hand about Danny's class (I'm sure it's good), but Bill Anderson of Chatham Artillery BBQ (numerous Grand Championships) has had an online class for several years now that is very good. Many people have won 'Grands' after buying into it. http://www.barbecuecoach.com/amember/go.php?r=295&i=l0
Lots of familier names are signed up to Bill's 'school'. And his lifetime membership is lifetime, when he changes cooking methods you get the new info.