I am right in the middle of the 6 month rotation. I started in January and will finish this summer. I don't plan to start another rotation (3 month this time I think) until January 2012. I want to utilize other instructors, dvds, programs, etc before jumping back in to STS. It's an excellent program but I know I will need the break. I crave the variety. That's just me though.
I think lots of people who are going to repeat it, give it a month or so before starting again....HTH!