That was answered in one of Granny's responses on a previous page (this thread.) I don't know anyone personally, but she said she does.
As you go along, the instructor will recommend that certain stories be polished up and sent to publications. I know one instructor who said she has some students who could publish fairly early, but that most need a lot of work. She said that by lesson 7 or 8, a lot of her students have learned enough to start submitting.
The instructors will try to take you from where you are to a more advanced level. If you start out with little skills, you won't come out of the course another C.S. Lewis. But, you'll be better than when you started (if you do all your homework!)
Recently I heard a complaint that a few of the instructors are too nice. They want to encourage students, so they don't edit very heavily. If my instructor did that, I'd be on her case or ask to change instructors. They know that some students are very sensitive, so they take that into consideration.
One student I heard from recently, said she was going to quit because there were marks all over her story. She felt so discouraged. I seriously thought about asking her who her instructor was, because I want that! I want my instructor to be truthful and ruthless with my writing. And, she is - I hope!
So, if you do decide to take the course, don't be afraid to speak up if the instructor is too easy. They may have made someone cry in the past and think you need the gentle approach, too. But, I don't think that's the best way to learn.
I still contend that they aren't that expensive compared to other learning opportunities. I was planning to go to some writing workshops this summer, and they are so much more than this course! They last for a few days; ICL last for months (up to two years).