We used several CTY courses. The pre-packaged ones had very little value added, but we love the writing classes and cryptography. I will say that we homeschooled and have just gone through private high school admissions. The official transcript from CTY (they are an accredited middle school) and the extensive written comments by teachers were, I think, really helpful for this process. Many schools that accepted her referenced these materials and they were the only "real" grades she had.