" Has anyone here purchased/viewed the videos, and do you consider worthwhile? "
Yes to both questions.
But if you previously, like myself, are used to Michael, Jeff & Eric with the Lightroom videos the style of presentation and level of detail is quite different.
If you have time it may also be worth signing up and attending some Capture One webinars, hosted by David Grover who appeared on & contributed to the Lula Capture One Pro 7 videos.