I started going through it, and unfortunately it takes control away from you way too often. I want to be able to toy around with the concepts after I learn them. I'd still recommend `vimtutor`.
I remember reading this beautiful essay Seven habits of effective text editing by Bram Moolenaar, the main author of Vim.
I like Vim adventures a lot. I think it's a better approach than this in a lot of ways.
On https://news.ycombinator.com/item?id=14658197 and its children I wrote something about the business model of VIM Adventures that you should consider before buying.
The only real shortcoming of vimtutor is that it cuts off before taking really advanced topics like buffers and windows.