Definitely worth it for the price. Unfortunately, the overall quality (i.e. effort put in by the writers) seems to go down with each episode (though it is pretty evident why this is). The episodes are still funny, however, and the animation is outstanding. You definitely need to know Star Wars to get most of the jokes.
The extra features are alright, such as the interview with George Lucas, but I've definitely heard better commentaries. BD Live is not very good either, you could probably find all the movies on youtube.