I did phase one distance learning and phase two full time and I could not fault oxford in their ground training at all!!
If you have the time and the money it is definately worthwhile doing the full time ground school course, I can pick up any of the notes that I studied in the classsroom and I can almost hear the lecture again, I just wish I had done phase one full time.
You work entirely at your own pace and they are quite flexible on brush up dates, Deena who works there is a star!!