Have no experience with this course, except seeing promo, however I have read the Course Supervisor materials, from long ago before it was packaged into those books, that - in the promo at least - resemble books for preschoolers.
For what it's worth, here are some excerpts from the Hubbard Key to Life Course Supervisor Series 0 -2, 1 November 1981, Issue II:
"It all started with an attempt to train some auditors to deliver a highly sophisticated and powerful new rundown. We had this great bridge section there, all researched and ready to go. But we found we had to build better approaches to the bridge. What we kept finding was that they were deeper in the swamp than we had noticed. So we went down further and found that they were in a canyon before they even got to the swamp. We thought, 'Well, we've got them in the canyon now and that's fine - we'll just take off from there', and then we found there was a ditch in the canyon. And where did we find this culture? In a hole at the bottom of the ditch... it was part of our modern culture."
Then it goes on about how apparently literate people were continually going past misunderstoods in their reading materials, the small words, etc. (Which seems to be a rehash of something covered on the Student Hat) Then it goes into the subject of grammar, and how badly it's taught, etc.
I can remember hating grammar as a kid in school, and also remember going out and buying some how-to books on grammar, which were helpful, plus devising (creatively) my own system of grammar, so I can relate to dry boring grammar teachers teaching grammar badly.
Anyway, the Course Supervisor materials continue:
"After the course had been in progress for some time it was found that students were continually making problems out of the course which led to a major discovery: people who are PTS make problems for others and for themselves. The remedy is to handle the PTSness - the problems vanish. This discovery led to a whole new rundown for handling PTSness which can be done on people who are relatively illiterate."
The only "inside information" I have on this course that it came about as Hubbard was frustrated that the Sea Org children/teenagers in the CMO, Cadet Org, etc. were not capable of understanding written instructions, these children, many of them, having never gone beyond grade school.
In the promo, at least, the books resemble colorful versions of old Communist Chinese re-education texts, which were made to resemble young children's picture books - the message (from the Chinese communists, circa 1950/1960s) being that even a (Chinese) college professor or businessman, or doctor, has an education that is worthless, and is, essentially, an infant (preschooler), who needs to be educated from the bottom up "in the Revolution."
Of course - back to KTL - understanding the meaning of words, and understanding grammar is a good thing, so, I'll withhold judgement on this.
A couple of questions, though, for those who have actually held the books in their hands, and actually did the course: Was it "confidential"? (Seems strange that it would be, but this is what I heard, although it doesn't make sense). Was it expected that everyone - even those who were Clear, OT7, etc., Student Hat grads, Method 1 Word Clearing completions, etc. - do the course?
Thanks.