Just curious but did you ever end up buying this from this guy? I was thinking of buying a training DVD from him but didn't know if he was a trusted seller or not.
http://www.retrievertraining.net/forums/showthread.php?101882-Set-Bumber-Boy-Derby-Double-FS
http://www.retrievertraining.net/forums/showthread.php?101882-Set-Bumber-Boy-Derby-Double-FS