Schweser audio

I am now an instructor for a CFA study course. I didn’t use the Schweser audio to study. I am interested in details from anyone who has used or is using them. Schweser says 20 hours of content. That sounds too short to be a word for word read of the text. Is there much content that isn’t straight from the text? How do you like it? Ok/enthralling/boring? Good use of time in the car? Do you listen first and then read the text, or vice versa? Do you perhaps listen later for review?

Thanks