I had a chance to watch ~half of Kasparov’s class on Masterclass. For casual player (1850 lichess in blitz and bullet, 77 percentile), it was close to useless. Too high level and pretty unstructured.
My experience watching carlos santana's class on guitar was similarly disappointing. He just keeps talking about "finding your sound" then plays a few notes. Not really helpful.
The only person I have seen do really good videos for guitar is Jimmy Bruno.
And, eventually, even he gave up.
Doing really good videos for training is really hard and takes a lot of work. Fundamentally, most people good at it conclude that online isn't worth it and that meatspace pays better.
Covid has flipped that around for a bit, but I suspect it will hold true again within a couple months.
Actually I find it the opposite: the material for this particular class is too simple and helps nothing if you already have some good chess knowledge and want to bring to expert/master level.
(Granted there are plenty of other resources for such, including a number of Kasparov books)
