I recently started using The Healing Codes after reading the book.
I have been using this type of work for years, in fact about half of my clients are therapists who use these sort of modalities.
I found The Healing Code to be effective in relieving some blues I was experiencing.
I would say that The Healing Code is good at creating a certain emotional state whereas The Emotion Code is good at quickly releasing a problem. I find The Emotion Code to be quicker but I might say that The Healing Code would be better for tying up some loose ends emotionally as well as physically.