I’ll chime in too. Although I haven’t got as far into the course as I would have like to, I have gone through enough to know it is worth the price, especially if you can get it for $40.
I love the “…for programmers” concept. He doesn’t waste time explaining the concepts that most people coming into Elixir are (probably) already familiar with. Moreover, the video demonstrating iex was extremely helpful, as I feel I can utilize iex more effectively and efficiently.
I look forward to completing the course. I just need to find the time 
Dave’s book was one of the best technical books I’ve ever read, so I am looking forward to the course.
It’s the best online course I have ever done, partly because it introduces you to new (or different/modern) ways of development.
