I thought the letter was very good.  A little wordy, but like you say, customized for the particular person, who is apparently looking to retain something "spiritual" or religious in life. 

Anyhow, he said some insightful things that I really agree with.  First, I liked his calling a meditation cult an "illusory system of supriority."

If you scratch below the surface of any premie, you will find spiritual ego, either based on that person's ability to "hold on" and "surrender" and "not leave no matter what" or just dumb luck.  "I don't know how I could have been so lucky."  blah, blah, blah, we know the lingo.

Holding on to that as the one thing that makes them feel better than other people, they may see ex-premies (painted in the most pejorative terms possible), as evidence that they really are better or special.  That's when you get this patronizing, "I feel sorry for you" bullshit from them.  I know, I was the same way.

In fact, it seems that this false sense of superiority is one of the two key elements of a cult, the other being "blame yourself, never the cult leader"  Of course, we all know this.  This was great:

In my research study of 308 former members from 101 different groups, for example, the items receiving the two highest ratings were "members feel they are part of a special elite" and "the group advocates or implies that when members disagree with the group about fundamental perceptions and beliefs...the member must be wrong."

This was also great and so true: