Well, I splitted Star Wars III using the scissors function on CloneDVD 2.8.5.1, haven't burned them to discs. But I had some doubts about the splitting procedure (read the tutorial on Elby's web page but ended somewhat confused). First disc was from chapters 1-26 (all Special Features checked), second disc, chapters 27-51 (all Special features unchecked). First disc compression bar showed 48% (it seemed no improvement took place after sppliting), second disc showed 100%. Was my sppliting procedure correct, or at least, good enough.