One of the toughest things about making courses is deciding which format to put them in. Some people hate videos. Some people hate reading. Some people like both, and want a transcript of the video... So in a not-so-sneaky way to conduct marker research... How do YOU prefer to learn stuff?
Reading, then audio, and then video if it's something you have to see demonstrated. I hate video when I want to know one or two specific things only, and I have to watch a video to find it even when it's bookmarked. I can read it faster.