I forgot something important:
I cannot talk for Roland and other dharma friends inclined to take this course, but I remember that at the beginning of my practice
The course seems quite well structured to me, if not perhaps a little expensive...
While it is not necessary,
Correction, doesn't have a beneficial force multiplier effect. No 'Freudian slip', mistake, Freud was a very ill man projecting his own deep seated issues
In light of metta and interdependence that can even be appreciated intellectually at the least and not in practice, I don't see how a 'siddhi' has a beneficial