My Take
I thought this was an excellent tool and doesn't require the teacher to know anything about programming. The instructions are good. I would like there to be embedded text-to-speech options however. This site goes very well with CODE.org.
How I Use It
This site provides an excellent opportunity for students to develop strong problem-solving skills while learning some basic programming languages. This is a self-paced process that can be choice-driven independent learning or guided by the teacher for the entire class.