Well for people who are weak at coursework I think they have a better chance to get a C with it. I know someone who failed English Edexcel and retook IGCE and passed with a C.
For A grades I think it is about the same. I like the concept of no coursework because it is fair. I took Edexcel English and achieved A*, but I was always in the teachers good-books. I think that does help on internally marked coursework, although it shouldn't!