Have you personally evaluated every single instructor that GUE has? If not, how can you make the guarantee?
If you did not tell a psychotherapist what this was pertaining to, and listed the kind of "conversion experiences" that people have with GUE, they would run away screaming "cult cult cult cult!"
Which is exactly what it looks like to many, myself included.
I'd love to see ANY agency guarantee that YOU (as a student), POST CLASS, when you are potentially able to judge whether you got good value or not, would find that you DID and that you found your instructor competent ONCE ABLE TO MAKE THE JUDGEMENT - and if you did not, they would (1) refund your fee, and (2) refund all your expenses to take the class (e.g. boat trips, gas, etc.)
Of course NO agency would do this, because it would mean that they would have to actually insure that their people were competent AND got good ratings, otherwise THEY would end up eating huge sums of cash.
(This is not an indictment of ONE agency - its an indictment of all!)