I've been reading this with interest. It is good to hear the 'other side' too.
We've seen loads of changes and improvements in our DS (3.5 years) since we started in February, but I'm not naive. I know that a lot of them could have come on their own and he might have been this good without us spending a penny. I would love to put all my hope in Robin and 100% believe that we can 'fix' DS's challenges, but there's no way I could ever do that just I'm case it didn't. And that's also why we keep up with the SALT and don't just dismiss his dx.
It's also easy to keep that skepticism as my DS was dx with autism, and when I first read Robin's book, he says he doesn't treat autism. While I completely understand how my DS met the diagnostic criteria for this, it's never felt like exactly the right dx for him. Robin agreed and here we are. Granted I'm no expert, but I do have experience of autism so hopefully I'm not just a mum in denial looking for 'cures' and willing to give my cash to anyone who says they have one.
In case it helps anyone, this is our experience. Since we started, DS's speech has exploded. We'd previously been doing private speech therapy which seemed to be working and we were gradually coaxing more words out of him but since TH, it's really sped up. And prior to TH, new words/phrases would be ones we'd focused on with him. Now he's coming out with LOADS of stuff that we haven't been focusing on. He does full, long, complex sentences, has conversations with us, asks questions, and has a funny little sense of humour. More and more pretend play (there was none before), answering people when they talk to him, responding to his name... And he was pretty quickly dry at night (getting him to actually do anything in the toilet is another matter but he's in a dry nappy every morning).
I think I've also developed a healthy skepticism as far as what the nhs tell me. On diagnosis, they categorically said there was no need to look into dietary changes or supplements as he didn't have a restricted diet. The diets/supplements changed him almost overnight, and it was really noticeable when he was ill and off them for a few days.
Yes, this might all have happened anyway but I'm happy enough to continue. Like others say, it can't hurt. The cost works out at less than £10 a week, which we can afford at the moment. And often I feel like the price is justified just to make me feel like I'm actually doing something.