I purchased the DVD set and it was helpful to my two children to watch it before they started the week’s lesson. I still think it’s important to read the notes for the week too, but I did find the video to be helpful since I know nothing about diagramming.
That being said, we ditched AG after 5 weeks. I personally found it to be diagramming overkill and that there were better ways to spend to spend our grammar time than diagramming. That is just my personal opinion and I wanted you to be aware that even tho my children did use the video, it was only used for 5 weeks of the program. I do think it was helpful for my children tho (and me).
Melissa