I've done it and can see the benefit. It also just makes sense to me. I do think the whole program is tedious. And I don't think it is a miracle cure. However, I think when we are so sick, for so long, we get into this spiral of negativity. For example, even as I was clearly recovering and doing better, every time I felt a twinge of a symptom, it would trigger thoughts of, "I'm going to be bedridden again. I'm never going to get better," etc. I think that kind of thinking can impede healing. The program basically retrains your brain to think different thoughts when triggered. So instead of dread and panic, you direct your brain to think of something else.
However, I also think you can train your brain to do these things without the program. My therapist taught me techniques to a) recognize when you're having a negative thought and b) redirect your thinking. The DNR System has very specific steps to take. But my therapist said that even doing things such as thinking of all the animals you can that start with the letter A can redirect your thoughts. Because you focus on thinking of something besides the negative thought that popped in your mind. Next time think of all the state capitals you can name or sing the Happy Birthday song, etc. When you first start doing this, you will catch negative thoughts happening all the time. But they eventually become less. You will still have negative thoughts, everyone including healthy people have negative thoughts. But you'll notice that you don't ruminate on it. You have the thought, and it goes away. I hope I'm making sense.
One thing I do like about the DNRS is the meditation aspect. I do think meditation is extremely beneficial to healing. I also think guided meditation is very beneficial, especially when first starting to practice meditation.
In a nutshell, I think the program has value. However, I think you can do similar things without spending $250. However, the program does have a money back guarantee after using it for 6 months. I know someone who sent it back and was refunded their money without question. So it may be worth the try for people considering it.