Seems sketechy to me, though I'm sure it's helped people. I signed up for something once and got bombarded with emails for months.
I strongly prefer Vipassana meditation. You can become enlightened simply by watching your mind as you observe the nuances of your breathing, and do nothing else for 50 years.
TM is just mantras which is simply another form of the same thing, yet for some reason they want to pass this off as esoteric knowledge. Most TM people I've heard from have an extremely limited understanding of the eastern philosophies that TM originates from which tells me it's just a repackaged, branded cult of knowledge that is otherwise free in no short supply all over the internet from people like Joseph Goldstein or Eckhart Tolle.