i think the demo videos on that zvex site are tremendous. very simple, fun and informative. someone who obviously knows his trade, but who doesn't make you feel like you're at the auto mechanic's shop trying to understand.....well, you know all those parts and "thingies" that need to be fixed.
it would be a dream to have the resources to pay someone like zachary vex to do a general demo video of all the different looping equipment....the basic functions anyway.