Starts out great... until you try the provided sample code.
The very first examples (yes, Hello World) won't even compile. And that's not just an environment problem : the code is really broken, referring to JavaFX packages that simply don't exist (e.g "javafx.builders", please mail me if you find that in JavaFX API). For a non-free programming learning resource, that is unacceptable.
Wow. Congratulations, guys. And to say I paid for this...