I'm taking the Basics class right now. I'm not really enjoying it that much because it feels like a real bother to work on the swatches when I'd rather be knitting other things. However, I am learning quite a bit, and it's good practice. I think I might take the professional finishing class .. maybe in the fall. The write-up says you have to knit a cardigan sweater, so at least I'd be making something useful and not just swatches. I don't think I'd have the patience for the master knitting program, at least not in the near future.
I took the equivalent only in Canada. I did it almost 10 years ago (weesh has it really been that long). I really enjoyed it, although some of it, I have never used again (isn't that how math class was..lol). I don't know if I would do it again, because I never really went into any sort of yarn/knitting business. I did get a really cool certificate and pin. And telling someone one you are a master knitter is pretty cool. I had it on my resume once, when I was applying for a job at a craft store. Never took it off, and on my latest job, the interviewer was like, we wanted to meet you cause we didn't know there was such thing as a master knitter..lol..So it may have helped me snag the job, got the foot in the door anyhow..lol