I definitely have Eliot and John to thank for my recent career switch. I was working as a technical recruiter for various major/global financial services institutions (yes, shoot me now please) and I took their iOS7 course and within 4 months was able to find work as a junior developer for a NYC based startup.
I've never considered making a course myself, but I will say that I could certainly learn some more from those two on how to be successful!