Genetic Testing

I'm just reading about genetic testing through GenOMind.  It may be too good to be true but they claim with some genetic testing with a mouth swab a doctor can better prescribe adhd meds.  The correct kind and the correct dose.  My ADHD husband has been through so many I can't even remember all the details over the years of trying.  This sounds like a great fit for getting a better outcome.  Does anyone have any success or failure stories with genetic testing?