I can also say that while that particular course was not formative for me (I took and enjoyed it, but it wasn't what got me into programming), I also can attribute at least the start of my career to Udacity. The CS101 course Udacity offered in Python many years ago was what really gave me the confidence to enter the dev scene and to start thinking about things as a real software engineer instead of hacking things together as I always had in the past.