I don't have any experience with these DVD's, but one of their creators is a little suspect in my mind, ever since I noticed this:
Foxy Openings Volume 14: Blackmar-Diemer Gambit {DVD} - USCF Sales
http://www.jeremysilman.com/chess_bi..._dmr_gmbt.html
That's the same author creating a DVD about how to play the Blackmar-Diemer Gambit, and also writing an article vehemently denouncing it.
--Fromper