I think it doesn’t teach anything you couldn’t learn yourself by reading the spec or css-tricks etc, however there’s just no way I would have bothered reading those things myself as in depth as I am going with the course. There’s definitely some information in the course that I don’t feel is useful, and I already knew quite a lot about css so most of it is familiar, but I still learn important things every time I sit down and go through a module. And I love the interactivity and actual practical challenges included.
So overall I give it an 8/10, and would recommend to anyone working (or who aspires to work) on the frontend.
Is it worth $350? If you’re on an average dev salary then yes, if you’re in school or not exactly floating in money, then I’d say stick to just reading free content online or making things you enjoy and learn by doing.
The course isn't necessary however. Reading through MDN docs in addition to Josh W Comeau's blog should get you 90% of the way there, if not all the way there.
Note: Not affiliated in any way.
Edit: adding source for my claim. Go to the website of the course that was already posted here and search for “Purchasing Power Parity”
I don’t yet know if I’m interested enough in this course, but I really appreciate content authors who consider pricing variations in different locations. Bonus if they offer to help people in tough situations (even in countries where PPP may be higher).