Some posting in this thread may not have experienced this yet, due to age restrictions, but if you rock up to someone in a loud night club or a bar (situations directly referenced by D&D in the Trilogy's 'booklet') it's really hard to start going into some ridiculous patter about your mystical magicalness. You're lucky if they can hear you speak. There's nothing impractical on the DVD, it's just really really hard to get it to look slick. Stuff like Portal in a night club, is gold.
The Goat change has one advantage over a cardini. The Cardini is somewhat angle sensitve. Someone stood beside you in the wrong place may spot it. The covering hand is only so big. The Goat change can be done when completely surrounded.
It depends what you like. Personally I like visual, impressive looking stuff, rather than a lot of patter. These tricks seem to have been designed in situations where you can't patter, and to not have that in your arsenal because it requires a lot of work is a bit sad.
Personally I thought it rocked, and I'm new to all of this, and so stuff like double lifts and basic changes still need some work, but this DVD and the trilogy has utterly changed how I handle and think about a deck of cards, and that is well worth it on its own. Moreover, the doubles I can now do, and how I encorporate them into routines is vastly different. This DVD rocks, period. lol.