This will reinforce a student's revision, it's not a substitute for it - it assumes a reasonably high level of understanding, and it moves quite swiftly across the topics, so if you aren't already familiar with the material, you'll quickly get lost.
It's not an all-singing, all-dancing, entertaining experience.
But I have found that it's a good way of getting my son to revise when he's tired of books - it's an opportunity to absorb the information in another format, and the presenters are clear and not patronising.