Trainsignal? cbt nuggets or even the ones from routersim... anyone tried any of these dvd's and liked/disliked them? i know the best way is to study the books and get real lab time, but i want to use one of these dvd's to add to my reading. sometimes having it instructed to you just let it sink in better. any of those 3 you have tried and your thoughts would be great, or any of video training you have tried... thanks in advance!