Seems like it is catered for the wealthy, a bit pricey, but the effects I hear is dramatic.
It seems to deviate from the simplicity of spiritual leaders, but then there is substinence considerations. There are many publicists for this including David Lynch (director of Mulholland drive, what a movie it is!!! http://www.imdb.com/title/tt0166924/ Only a pure spiritualist could conceive of such a movie) and he does have a very convincing case study (his own) that exemplifies the value of TM.
The Teachings of Guru Dev - The Roots of TM' Quotations of Shankaracharya Swami Brahmananda Saraswati