Taking the course now, after completing Udacity CS101 and Learn Python the Hard Way. The course is much less thorough than CS101 and many concepts are poorly explained.
For example, after explaining briefly what a token is, the instructor will show a 3 minute video with him using a Lexer to go through tokens, (without any explanation of how it works, why he wrote it that way, what the code does, how it interprets tokens, or anything else), then assign homework problems where you have to make them. You end up rewatching the videos several times and looking for content outside of the class.
You'll learn, but don't expect explanations as thorough as in CS101 and expect to do self learning just to keep up.