I am currently doing a Writers Bureau creative writing course, and I think its quite good. I have heard the same from a couple of other people. The only reason that I am doing this course is to find where my strengths and weaknesses lie as a writer, and to find a niche I could specialize in.
I suppose the course materials might not be good for someone with alot of experience, but for a beginner they are good. I still refer to my course books for alot of things, ranging from writing query letters to writing short fiction (which is an area I am still struggling with). The feedback from the tutors is very helpful to me, which was another reason why I joined up - I needed an experienced writer to tell me where I might be going wrong.