I'm just going through this and while I love the concept, there is one criticism from me. The course is very comfortable to walk through, but it doesn't make use of the benefits of the online environment.

It is just "this is how it goes, now type it" kind of teaching. I am almost done with the second session, and most likely have completely forgotten most of the content from the first. If anybody else is going to try teaching stuff in a similar way, please let me try to play/try out stuff as early as possible. Even if the exercises are completely pointless, please make them a bit harder than just exchanging an "+" for an "-". It feels so pointless having such a great learning environment and not using it to make it feel less of a brain-dump process.