I am on the second month of GAPS. The first month was spent on the GAPS Intro diet, which is a strict diet to jump start the healing and sealing of the gut. The Intro diet is also quite detoxifying.
I do not have a mental or emotional disorder, most likely because I have been treated under the care of a classical homeopath for over a decade. I am relatively normal, albeit with food intolerances and digestive issues. Dyslexia, anxiety, and gut dysbiosis runs rampant in my family, however.
I notice on GAPS that my mind and emotions are much, much calmer and a new sense of peace and contentment that is not related to outward circumstances. I get less overwhelmed and fatigued. Since starting GAPS, I have experienced episodes of recurrences of old nightmares and sleep talking. This indicates to me that my brain is detoxing as old symptoms are re-traced through my system. Indeed I have cycled through several episodes of physical, mental, and emotional detox/die-off since starting GAPS. Each time I re-emerge after an episode, I feel better.
The other benefit is that the bad breath and body odor is gone. At the start of GAPS it got worse for a while, and then slowly went away. My sweetie has a very sensitive nose and he is no longer concerned whether I have brushed my teeth or not.
Even though I have only recently started GAPS, I feel that it is working for me on very deep levels.
I ate a clean paleo diet for four months prior to GAPS. I do feel that the paleo/primal diet was helpful in preparing my body for GAPS. The paleo/primal diet helped me recover quite quickly from fatigue and endocrine imbalances. And then I noticed that the bloating and food intolerances were starting to creep back. In particular, I developed pain after eating egg whites, and eggs were a breakfast staple for me. The GAPS diet is designed to heal and soothe the gut so that food intolerances subside. I still cannot eat egg whites after two months on GAPS, nor dairy. I haven't even tried any other offending foods; it is way too early in the process.
GAPS has been lots of work (and a little more costly) and I have had to alter my lifestyle to accomodate for it. Yet the resulting peace and contentment is worth it.