I love projects that popularize vim. But I think this one might be in a way too early stage to justify the pricing (assuming those 8 lessons are all there is).
Sorry, I meant 8 chapters. I read through the 34 lessons. I suggest you take a look at typingclub. 700+ lessons free of charge. Repetition, and metrics are the selling point. If you incorporate that model in vimified I think you’ll have way wider adoption.
After reading Practical Vim by Drew Neil I went to his site to check out what else he has. Well he's selling a course that looked like the majority of what he's covered in the book. When I saw the $150 price tag I couldn't believe my eyes.
I left the site and bought his other Vim book instead.